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贵州省巧马中学2011届高三物理一轮复习教案:18.2.电磁振荡的周期和频率


relationship betwee n G overnment a nd busines s. T he "two se ssions", Ge neral Se cretary of "Pro", "clear" the w ord s uccinctly sum marize d the new relati ons hip betwee n G overnment a nd busine ss, as pure politi cs, res haping the politi cal relati ons hip spe cified i n the direction. Di strict lea ders in handling pol itical a nd busi nes s relations, e ngage in tradi ng power for money, a nd finally stumble d, we a le ss on, alway s keep i n mind t hat "Pro", "clea n" practicing "Pro", "cle ar". "Pro" is to ope n a sincere e ngagement wit h private enter prise t o hel p solv e practi cal difficulties; " Cle ar "is to clarify the Div ision of pow er, exerci sed i n accordance with, priv ate entre prene urs wit h innocent purity, not a busing power for personal gain, not to engage i n trading power for money. Thir d, in order to mai ntain fairne ss and justice . Fairness a nd justi ce is the lifeline of the rule of law, is t he be st devel opme nt environment. Curre ntly, lax law e nforceme nt and the j udi cial se ctor i n our regi on al so exist t o varying degre es, law e nforceme nt de partments a nd i ndivi dual wi ndow units power for pers onal gai ns and bri bes, t hick frie nds , relations, human cases , money case s in w hich seri ously infringe on the legitimate right s and interests of enter prises a nd people. E specially some law e nforceme nt and inspe ction for profit purpose s, del iberately l ooki ng for cor porate l oopholes, found dire ctly under t he ticket does not give busi nes s improveme nt opportunitie s. We re cruit a com pany doesn't easil y, cultivating a busine ss more difficult, never for per sonal gain, sy stematic hara ssment, card, la st checke d to check t o get the e nterpri se collapsed. To g uarantee t he legitimate rights a nd i nt erests. Al ways pr ocee d from the overall situati on of reform and development of service s, fully consider the characteristi cs of prod ucti on a nd ma nagement i n non -publi c enter prises a nd social benefits, a n accurate gras p of legal limits, protect t he ent husiasm of entre preneurs a nd practiti oners i n innovati on a nd e ntrepre neur shi p, enhancing ex pectati ons and confide nce . To prom ote strict e nforcement. Strengthe ning l aw enfor cement procedure s, impr ove law e nforcement performance eval uation, strengt heni ng the super visi on of law enforcement, expl oration and practi ce of risk control me cha nism of law e nforceme nt to further standardize t he s ocial security, urba n management, roa d traffic administrative law enfor cement, effectively free, extensive law-enforcement and lax enforcement of law enfor cement a nd ot her is sues . To uphol d justi ce. Justice i s the last li ne of Defens e to safeguar d fairness a nd j ustice, to unequivocally s upport the courts and procuratorates inde pendently exerci se level .. . Judi cial activitie s were rampant, m ust not be all owed to r un, favors, m one y, must not be all owed t o knowingly violate the miscarriage, violati ons of the legitim ate rights a nd intere sts of the mass es must not be all owe d to abuse of powe r, to make forest mass ca n be felt in every judicial case s in e quity a nd j ustice . Four to dee pen gras s-roots gover nance accor ding to la w

电磁振荡的周期和频率
一、教育目标 1.理解 LC 振荡电路的固有周期(频率)的决定因素

确应用公式进行相关的计算 二、重点、难点、疑点及解决办法 1.重点 LC 振荡电路的周期公式,频率公式是教材中的重点内容。通过实验现象观察,定性地得

出了电感 L 大(小)、电容 C 大(小)、周期长(短)的结论。
2.疑点 为什么电容越大,电感越大,周期就越大?通过对电容充放电作用,

理解。 三、教具准备 1.LC 振荡回路示教板,准备两个以上电感不同的线圈(可拆变压器的 220V 线圈),电容


2.大屏幕示波器(观察振荡电流周期变化情况)等 3.每两个学生一只中波小收音机 四、课时安排 1

课时

五、教学步骤 1.引入新课

Grass-r oots gov erna nce a ccordi ng to law is a n importa nt foundation for prom oting the construction of rule of law, but als o the most basi c devel opme nt environment. Des pite my good social order in Ge neral, but ther e are law-a bidi ng consci ous nes s, social order is not sta ndard, regardle ss of faith, Twining visit vis it and other outsta ndi ng problems. We want to a ctively pr omote the fiel d of multi-lev el governa nce accordi ng to la w, pr omote the conti nuous improveme nt of the s ocial e nvironment. To pr omote universal complia nce. Actively foster t he rule of law cult ure, carry out law publicity a nd educati on on honesty and trustw orthiness, g uide t he masse s and cons ciously a bide by the la w, failing to fin d method, probl em-s olving method, method of gradual ly cha nging t he worl d, he is not looking for but some one " uns poke n rule s", form ed all law la w, abi de by t he good atmos phere. To strengthe n the compre hensive manageme nt of public security. Deepeni ng pea ce xinga n construction, strongly against vi olence crime, mafia and s erious crimi nal offences, to protect t he legitimate rights a nd intere sts of citize ns, l egal pers ons, carry out crimi nal policy of temper 。 计 设 材 驭 驾 度 高 论 从 据 依 和 想 思 导 指 学 教 题 为 作 ) 维 三 ( 目 中 程 把 要 是 就 课 .说 准 标 量 质 后 用 使 付 ; 续 手 面 书 理 办 方 甲 时 管 接 交 移 在 并 , 收 验 工 竣 的 业 物 本 与 参 justice with mercy, the maximum stimulati ng s ocial vitalit y, and earne stly safeguard social harm ony and sta bility. To res olve s ocial conflicts by law. To furt her smooth cha nnel s of reporting s ocial conditi ons and public opi nion, impr oving regul ation, arbitration, as wel l as di spute resol ution mechani sms, implement fully t he petiti oners ' case s "third -party" heari ngs a nd s upervi sing sy stem of letters and calls, and t o resolv e the inv olved law l awsuit into the orbit of rule of la w, vexatious, Twini ng visit visit, distur bing social or der and other malici ous extort i on, re sol utely crack down. Five , improv ing cadre s V itale, provi de strong prote ction for forest devel opme nt XI General Se cret ary stress ed that t he comprehensiv e revitalization in Northe ast China, needs a hig h quality, soli d style, ca dres of the dare t o play. Cadr e cadre s is a pledge, shoul d want to do w ork and able t o do good, ent husias m is paramount. Treat party cadre s, it is nece ssary to Strict ma nagement, a nd warm care, enable t he br oad mass es of ca dres w ork hard work, this is tw o parallel principle s. I n strict a ccor dance wit h the sta ndar ds of good cadres sele ction and appointme nt, the real officers, dare officers, those w ho wa nt to play, good as excell ent ca dres at all levels of leaders hip i n the pa st. At prese nt, some lea ding cadres w ork initiative i s not high, beyond political , idle , lazy governance governance, not as, sl ow, mes sy and a phenomenon still exist to varyi ng deg ree s, affected and restricte d economi c and social development. We m ust mobilize the enthusiasm of cadres a s an urge nt task, adhere to combi nation of incentives a nd constraints, a nd a dhere to the stri ct management a nd warm care, pra ctical s oluti on "for the officer s not to" pr obl em, motivate cadres a nd better lead the masses to a n undertaki ng, the cadres a nd create the new achieveme nt in a dare t o play, g ood at shows as new. To ide ntify the problem, accurate puls e

relationship betwee n G overnment a nd busines s. T he "two se ssions", Ge neral Se cretary of "Pro", "clear" the w ord s uccinctly sum marize d the new relati ons hip betwee n G overnment a nd busine ss, as pure politi cs, res haping the politi cal relati ons hip spe cified i n the direction. Di strict lea ders in handling pol itical a nd busi nes s relations, e ngage in tradi ng power for money, a nd finally stumble d, we a le ss on, alway s keep i n mind t hat "Pro", "clea n" practicing "Pro", "cle ar". "Pro" is to ope n a sincere e ngagement wit h private enter prise t o hel p solv e practi cal difficulties; " Cle ar "is to clarify the Div ision of pow er, exerci sed i n accordance wit h, private entre prene urs wit h innocent purity, not a busing power for personal gain, not to engage i n trading power for money. Thir d, in order to mai ntain fairne ss and justice . Fairness a nd justi ce is the lifeline of the rule of law, is t he be st devel opme nt environment. Curre ntly, lax law e nforceme nt and the j udi cial se ctor i n our regi on al so exist t o varying degre es, law e nforceme nt de partments a nd i ndivi dual wi ndow units power for pers onal gai ns and bri bes, t hick frie nds , relations, human cases , money case s in w hich seri ously infringe on the legitimate right s and interests of enter prises a nd people. E specially some law e nforceme nt and inspe ction for profit purpose s, del iberately l ooki ng for cor porate l oopholes, found dire ctly under t he ticket does not give busi nes s improveme nt opportunitie s. We re cruit a com pany doesn't easil y, cultivating a busine ss more difficult, never for per sonal gain, sy stematic hara ssment, card, la st checke d to check t o get the e nterpri se collapsed. To g uarantee t he legitimate rights a nd i nterests. Al ways pr ocee d from the overall situati on of reform and development of service s, fully consider the characteristi cs of producti on a nd ma nagement i n non -publi c enter prises a nd social benefits, a n accurate gras p of legal limits, protect t he ent husiasm of entre preneurs a nd practiti oners i n innovati on a nd e ntrepre neur shi p, enhancing ex pectati ons and confide nce . To prom ote strict e nforcement. Strengthe ning l aw enfor cement procedure s, impr ove law e nforcement performance eval uation, strengt heni ng t he supervisi on of law enforcement, expl oration and practi ce of risk control me cha nism of law e nforceme nt to further standardize t he s ocial security, urba n management, roa d traffic administrative law enfor cement, effectively free, extensive law-enforcement and lax enforcement of law enfor cement a nd ot her is sues . To uphol d justi ce. Justice i s the last li ne of Defens e to safeguar d fairness a nd j ustice, to unequivocally s upport the courts and procuratorates inde pendently exerci se level .. . Judi cial activitie s w ere rampant, m ust not be all owed to r un, favors, m one y, must not be all owed t o knowingly violate the miscarriage, violati ons of the legitimate rights a nd intere sts of the mass es must not be all owe d to abuse of powe r, to make forest mass ca n be felt in every judicial case s in e quity a nd j ustice . Four to dee pen gras s-roots gover nance accor ding to la w

上节课我们通过比较电磁振荡与简谐运动有很多相似之处, 它们运动都有周期性,我们知道振动的周 期只与其本身的条件有关,而电磁振荡中的振荡电流周期又是由什么因素决定的呢?电感 L、电容 C 的

大小对振荡的快慢有怎样的影响?其它因素(q、i、U 大小)与周期有没有关系?下面来研究 这个问题。
2.提出问题 (1)机械振动中,周期和频率的概念、意义是什么?单摆周期由什么决定?

(2)电磁振荡的周期和频率的意义是什么? 在同学回答的基础上, 归纳指出, 振荡电路里发生无阻尼自由振荡时的周期和频率叫做振荡电路的固 有周期和固有频率。 对比,联系单摆的振动,初步猜测一下电磁振荡的周期和频率与什么因素有关系?与 LC 回路中的

电感 L、电容 C 有何关系(定性)?
2.演示实验 简介图 1 所示电路,多抽头带铁芯的线圈,L 值较大(可用 220V 或二个 110V 可拆变压器

线圈串联而成)2-3 个电解电容器(100μ F、500μ F、1000μ F)演示电流表(指针在表盘中央), 二个电源(6V,45V)等

观察什么?(电流表指针摆动的快慢)选用不同的 L 或 C 值,发生电磁振荡 时,电流表指针摆动的快慢程度(周期和频率)与 L、C 值的初步关系是什么?
操作和观察 启发同学根据实验现象,推理、分析得到①电容 C 不变时,电感 L 越大,振荡周期 T 就越长,

频率越低。②当电感 L 不变时,电容 C 越大,振荡周期就越长,频率越低。
换用不同电压的电源,当 L、C 值不变时,表针摆动的快慢程度相同(仅摆动次数不同) 在同学回答的基础上小结指出

Grass-r oots gov erna nce a ccordi ng to law is a n importa nt foundation for prom oting the construction of rule of law, but als o the most basi c devel opme nt environment. Des pite my good social order in Ge neral, but ther e are law-a bidi ng consci ous nes s, social order is not sta ndard, regardle ss of faith, Twining visit vis it and other outsta ndi ng problems. We want to a ctively pr omote the fiel d of multi -lev el governa nce accordi ng to la w, pr omote the conti nuous improveme nt of the s ocial e nvironment. To pr omote universal complia nce. Actively foster t he rule of law cult ure, carry out law publicity a nd educati on on honesty and trustw orthiness, g uide t he masse s and cons ciously a bide by the la w, failing to find method, probl em-s olving method, method of gradual ly cha nging t he worl d, he is not looking for but some one " uns poke n rule s", formed all law la w, abi de by t he good atmos phere. To strengthe n the compre hensive manageme nt of public security. Deepeni ng pea ce xinga n construction, strongly against vi olence crime, mafia and s erious crimi nal offenc es, to protect t he legitimate rights a nd intere sts of citize ns, l egal pers ons, carry out crimi nal policy of temper 。 计 设 材 驭 驾 度 高 论 从 据 依 和 想 思 导 指 学 教 题 为 作 ) 维 三 ( 目 中 程 把 要 是 就 课 .说 准 标 量 质 后 用 使 付 ; 续 手 面 书 理 办 方 甲 时 管 接 交 移 在 并 , 收 验 工 竣 的 业 物 本 与 参 justice with mercy, the maximum stimulati ng s ocial vitalit y, and earne stly safeguard social harm ony and sta bility. To res olve s ocial conflicts by law. To furt her smooth cha nnel s of reporting s ocial conditi ons and public opi nion, impr oving regul ation, arbitration, as wel l as di spute resol ution mechani sms, implement fully t he petiti oners ' case s "third -party" heari ngs a nd s upervi sing sy stem of letters and calls, and t o resolv e the inv olved law l awsuit into the orbit of rule of la w, vexatious, Twini ng visit visit, distur bing social or der and other malici ous extorti on, re sol utely crack down. Five , improv ing cadre s V itale, provi de strong prote ction f or forest devel opme nt XI General Se cretary stress ed that t he comprehensiv e revitalization in Northe ast China, needs a hig h quality, soli d style, ca dres of the dare t o play. Cadr e cadre s is a pledge, shoul d want to do w ork and able t o do good, ent husias m is paramount. Treat party cadre s, it is nece ssary to Strict ma nagement, a nd warm care, enable t he br oad mass es of ca dres w ork hard work, this is tw o parallel principle s. I n strict a ccor dance wit h the sta ndar ds of good cadres sele ction and appointme nt, the real officers, dare officers, those w ho wa nt to play, good as excell ent ca dres at all levels of leaders hip i n the pa st. At prese nt, some lea ding cadres w ork initiative i s not high, beyond political , idle , lazy governance governance, not as, sl ow, mes sy and a phenomenon still exist to varyi ng degree s, affected and restricte d economi c and social development. We m ust mobilize the enthusiasm of cadres a s an urge nt task, adhere to combi nation of incentives a nd constraints, a nd a dhere to the stri ct management a nd warm care, pra ctical s oluti on "for the officer s not to" pr obl em, motivate cadres a nd better lead the masses to a n undertaki ng, the cadres a nd create the new achieveme nt in a dare t o play, g ood at shows as new. To ide ntify the problem, accurate puls e

relationship betwee n Gover nment a nd busi nes s. The "two sessi ons", General Secretary of "Pro", "clear" the w ord s uccinctly sum marize d the new relations hip betwee n Gover nment and busi ness , as pure politics , resha ping the political relati ons hip spe cified in t he dire ction. Distri ct leader s in ha ndl ing politi cal and busi ness relati ons, engage i n trading power for money, a nd finally stumble d, we a le sson, always kee p i n mind that "Pro", "cle an" practi cing "Pr o", "clear". "Pro" is to ope n a sincere e ngagement with private enterpri se to help s olve pra ctical difficulties ; " Clear "is to clarify the Divis ion of power, exercise d in a ccor dance wit h, private entre preneurs wit h innocent purity, not abusi ng power for pers onal gain, not to engage i n trading power for money. Thir d, in or der to maintai n fairnes s and j usti ce. Fairne ss and justice is t he lifeline of the rule of la w, is the best development envir onment. Curre ntly, lax law e nforceme nt and t he judicia l sect or in our region als o exist to varying degrees, law e nforceme nt de partments and individual wi ndow units power for pers ona l gains a nd br ibe s, thick frie nds , relations, human cases, m oney cases i n whi ch s eriously infringe on t he legitimate rights a nd intere sts of enter prises a nd people. E spe cially s ome law enfor cement a nd inspe ction for profit purposes , deli berately looking for corporate loopholes, found dire ctly under the ti cket does not give busine ss improveme nt opport unitie s. We re cruit a company doe sn't easil y, cultivating a busi ness mor e difficult, never for pers ona l gain, systematic harassme nt, car d, last checke d to check t o get the enter prise colla pse d. To guarantee t he legitimate rights a nd intere sts. Always proceed from the overall situati on of reform and devel opme nt of service s, fully consi der the characteri stics of producti on a nd ma nagement in non-public e nterpris es and social benefits, a n accurate gras p of legal limits, prote ct the e nthusiasm of entre preneurs a nd pra ct itioners in i nnovation and entrepre ne urshi p, enha nci ng expectati ons a nd confidence. To promote stri ct enforcem ent. Strengthe ning la w enforcement pr oce dures, im prove law e nforceme nt performance eval uation, strengtheni ng the s upervi sion of law enfor cem ent, exploration and practi ce of risk contr ol mechanism of law enforceme nt to further sta ndar dize the social se curit y, ur ban

management, roa d traffic administrative law enfor cement, effectively free, extensive law-enforcement and lax enforcement of law enfor cement a nd ot her is sues . To uphol d justi ce. Justice i s the last li ne of Defens e to safeguar d fairness a nd j ustice, to unequivocally s upport the courts and procuratorates inde pendently exerci se level .. . Judi cial activitie s were rampant, m ust not be all ow ed to r un, favors, m one y, must not be all owed t o knowingly violate the miscarriage, violati ons of the legitimate rights a nd intere sts of the mass es must not be all owe d to abuse of powe r, to make forest mass ca n be felt in every judicial case s in e quity a nd j ustice . Four to dee pen gras s-roots gover nance accor ding to la w

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LC 振荡电路的固有周期(T)和固有频率(f),决定于电路中线圈的电感 L 和电容器的电容

C
[提出问题]上述现象如何解释? [归纳指出]电容越大,容纳电荷就越多,充放电需要的时间就越长,因而周期就长,频 率就低。线圈的电感 L 越大,阻碍电流变化的延时作用就越强,使放电、充电的时间就越长, 因而周期就越长, 频率就越低, 总而言之, LC 电路的周期和频率由电路本身的性质(L、 C 的值)

决定,与电容器的带电量的多少,电流大小无关。
3.固有周期和固有频率公式 大量精确的实验和电磁学理论证明,电磁振荡的固有周期 T,跟 LC

式中 T、f、L、C 的单位分别是秒、赫、亨和法(单位符号是 s、Hz、H、F) 公式表明,适当地选择电容 C 和电感 L,就可以使电路的固有周期和频率符合我们的各种需 要,通常应用中是可变电容器和电感线圈组成 LC 电路,要得到不同周期和频率的振荡电流, 可通过改变电容器的电容 C 来实现,如图 2 所示,亦可通过改变电感 L 来实现,如图 3 所示

收音机中调节谐振电路的周期,就是通过调节可变电容来实现的。 让学生打开收音机,观察并找到调谐电容。调节调揩旋钮时,观察动片的变化。 要求学生分析 ①旋入动片,旋出动片时正对面积如何变化?电容 C 大小如何改变? ②C 变化对周期、频率大小变化有何关系 4.巩固练习(含机动内容)
Grass-r oots gov erna nce a ccordi ng to law is a n importa nt foundation for prom oting the construction of rule of law, but als o the most basi c devel opme nt environment. Des pite my good social order in Ge neral, but ther e are law-a bidi ng consci ous nes s, social order is not sta ndard, regardle ss of faith, Twining visit vis it and other outsta ndi ng problems. We want to a ctively pr omote the fiel d of multi-lev el governa nce accordi ng to la w, pr omote the conti nuous improveme nt of the s ocial e nvironment. To pr omote universal complia nce. Actively fost er t he rule of law cult ure, carry out law publicity a nd educati on on honesty and trustw orthiness, g uide t he masse s and cons ciously a bide by the la w, failing to find method, probl em-s olving method, method of gradual ly cha nging t he worl d, he is not looking for but some one " uns poke n rule s", formed all law la w, abi de by t he good atmos phere. To strengthe n the compre hensive manageme nt of pu blic security. Deepeni ng pea ce xinga n construction, strongly against vi olence crime, mafia and s erious crimi nal offences, to protect t he legitimate rights a nd intere sts of citize ns, l egal pers ons, carry out crimi nal policy of temper 。 计 设 材 驭 驾 度 高 论 从 据 依 和 想 思 导 指 学 教 题 为 作 ) 维 三 ( 目 中 程 把 要 是 就 课 .说 准 标 量 质 后 用 使 付 ; 续 手 面 书 理 办 方 甲 时 管 接 交 移 在 并 , 收 验 工 竣 的 业 物 本 与 参 justice with mercy, the maximum stimulati ng s ocial vitalit y, and earne stly safeguard social harm ony and sta bility. To res olve s ocial conflicts by law. To furt her smooth cha nnel s of reporting s ocial conditi ons and public opi nion, impr oving regul ation, arbitration, as wel l as di spute resol ution mechani sms, implement fully t he petiti oners ' case s "third -party" heari ngs a nd s upervi sing sy stem of letters and calls, and t o resolv e the inv olved law l awsuit into the orbit of rule of la w, vexatious, Twini ng visit visit, distur bing social or der and other malici ous extorti on, re sol utely crack down. Five , improv ing cadre s V itale, provi de strong prote ction for forest devel opme nt XI General Se cretary stress ed that t he comprehensiv e revitalization in Northe ast China, needs a hig h quality, soli d style, ca dres of the dare t o play. Cadr e cadre s is a pledge, shoul d want to do w ork and able t o do good, ent husias m is paramount. Treat party cadre s, it is nece ssary to Strict ma nagement, a nd warm care, enable t he br oad mass es of ca dres w ork hard wor k, this is tw o parallel principle s. I n strict a ccor dance wit h the sta ndar ds of good cadres sele ction and appointme nt, the real officers, dare officers, those w ho wa nt to play, good as excell ent ca dres at all levels of leaders hip i n the pa st. At prese nt, some lea ding cadres w ork initiative i s not high, beyond political , idle , lazy governance governance, not as, sl ow, mes sy and a phenom enon still exist to varyi ng degree s, affected and restricte d economi c and social development. We m ust mobilize the enthusiasm of cadres a s an urge nt task, adhere to combi nation of incentives a nd constraints, a nd a dhere to the stri ct management a nd warm care, pra ctical s oluti on "for the officer s not to" pr obl em, motivate cadres a nd better lead the masses to a n undertaki ng, the cadres a nd create the new achieveme nt in a dare t o play, g ood at shows as new. To ide ntify the problem, accurate puls e

relationship betwee n G overnment a nd busines s. T he "two se ssions", Ge neral Se cretary of "Pro", "clear" the w ord s uccinctly sum marize d the new relati ons hip betwee n G overnment a nd busine ss, as pure politi cs, res haping the politi cal relati ons hip spe cified i n the direction. Di strict lea ders in handling pol itical a nd busi nes s relations, e ngage in tradi ng power for money, a nd finally stumble d, we a le ss on, alway s keep i n mind t hat "Pro", "clea n" practicing "Pro", "cle ar". "Pro" is to ope n a sincere e ngagement wit h private enter prise t o hel p solv e practi cal difficulties; " Cle ar "is to clarify the Div ision of pow er, exerci sed i n accordance wit h, private entre prene urs wit h innocent purity, not a busing power for personal gain, not to engage i n trading power for money. Thir d, in order to mai ntain fairne ss and justice . Fairness a nd justi ce is the lifeline of the rule of law, is t he be st devel opme nt environment. Curre ntly, lax law e nforceme nt and the j udi cial se ctor i n our regi on al so exist t o varying degre es, law e nforceme nt de partments a nd i ndivi dual wi ndow units power for pers onal gai ns and bri bes, t hick frie nds , relations, human cases , money case s in w hich seri ously infringe on the legitimate right s and interests of enter prises a nd people. E specially some law e nforceme nt and inspe ction for profit purpose s, del iberately l ooki ng for cor porate l oopholes, found dire ctly under t he ticket does not give busi nes s improveme nt opportunitie s. We re cruit a com pany doesn't easil y, cultivating a busine ss more difficult, never for per sonal gain, sy stematic hara ssment, card, la st checke d to check t o get the e nterpri se collapsed. To g uarantee t he legitimate rights a nd i nterests. Al ways pr ocee d from the overall situati on of reform and development of service s, fully consider the characteristi cs of producti on a nd ma nagement i n non -publi c enter prises a nd social benefits, a n accurate gras p of legal limits, protect t he ent husiasm of entre preneurs a nd practiti oners i n innovati on a nd e ntrepre neur shi p, enhancing ex pectati ons and confide nce . To prom ote strict e nforcement. Strengthe ning l aw enfor cement procedure s, impr ove law e nforcement performance eval uation, strengt heni ng t he supervisi on of law enforcement, expl oration and practi ce of risk control me cha nism of law e nforceme nt to further standardize t he s ocial security, urba n management, roa d traffic administrative law enfor cement, effectively free, extensive law-enforcement and lax enforcement of law enfor cement a nd ot her is sues . To uphol d justi ce. Justice i s the last li ne of Defens e to safeguar d fairness a nd j ustice, to unequivocally s upport the courts and procuratorates inde pendently exerci se level .. . Judi cial activitie s w ere rampant, m ust not be all owed to r un, favors, m one y, must not be all owed t o knowingly violate the miscarriage, violati ons of the legitimate rights a nd intere sts of the mass es must not be all owe d to abuse of powe r, to make forest mass ca n be felt in every judicial case s in e quity a nd j ustice . Four to dee pen gras s-roots gover nance accor ding to la w

例1 如图 4 所示的 LC 振荡电路中,可变电容器 C 的取值范围为 10pF~360pF,线圈的 电感 L=0.10H,求此电路能获得的振荡电流的最高频率多大?最低频率又为多少?

当电容 C 为最大值时(即 C2=360pF)振荡电流的频率最低,所以由题给条件,即可求得最

高和最低频率, 计算时注意各量要用相应的国际单位制的主单位。 电容 C1=10pF=10×10-12F =1×10-11F,C2=360pF=360×10-12F=3.6×10-10F 则有最高频率 f1 和最低频率 f2 分别为

有一 LC 振荡电路,当电容调节为 C=20pF 时,能产生频率为 f1=500kHz 的振荡电 流,要获得频率为 f2=1.0×103kHz 的振荡电流,则可变容器应调整多大?(设电感 L 保持不 变)
解析

例2

在已知电容 C1 和固有频率 f1 的条件下,根据公式

再应用频率公式,即可求得 f2=1×103kHz 时,对应的电容 C2 值!

=5×10-11(F)=50pF 方法对,但较繁,有否更简便些的求法?应用比例法求解较为简捷,由公式

Grass-r oots gov erna nce a ccordi ng to law is a n importa nt foundation for prom oting the construction of rule of law, but als o the most basi c devel opme nt environment. Des pite my good social order in Ge neral, but ther e are law-a bidi ng consci ous nes s, social order is not sta ndard, regardle ss of faith, Twining visit vis it and other outsta ndi ng problems. We want to a ctively pr omote the fiel d of multi -lev el governa nce accordi ng to la w, pr omote the conti nuous improveme nt of the s ocial e nvironment. To pr omote universal complia nce. Actively foster t he rule of law cult ure, carry out law publicity a nd educati on on honesty and trustw orthiness, g uide t he masse s and cons ciously a bide by the la w, failing to find method, probl em-s olving method, method of gradual ly cha nging t he worl d, he is not looking for but some one " uns poke n rule s", formed all law la w, abi de by t he good atmos phere. To strengthe n the compre hensive manageme nt of public security. Deepeni ng pea ce xinga n construction, strongly against vi olence crime, mafia and s erious crimi nal offenc es, to protect t he legitimate rights a nd intere sts of citize ns, l egal pers ons, carry out crimi nal policy of temper 。 计 设 材 驭 驾 度 高 论 从 据 依 和 想 思 导 指 学 教 题 为 作 ) 维 三 ( 目 中 程 把 要 是 就 课 .说 准 标 量 质 后 用 使 付 ; 续 手 面 书 理 办 方 甲 时 管 接 交 移 在 并 , 收 验 工 竣 的 业 物 本 与 参 justice with mercy, the maximum stimulati ng s ocial vitalit y, and earne stly safeguard social harm ony and sta bility. To res olve s ocial conflicts by law. To furt her smooth cha nnel s of reporting s ocial conditi ons and public opi nion, impr oving regul ation, arbitration, as wel l as di spute resol ution mechani sms, implement fully t he petiti oners ' case s "third -party" heari ngs a nd s upervi sing sy stem of letters and calls, and t o resolv e the inv olved law l awsuit into the orbit of rule of la w, vexatious, Twini ng visit visit, distur bing social or der and other malici ous extorti on, re sol utely crack down. Five , improv ing cadre s V itale, provi de strong prote ction f or forest devel opme nt XI General Se cretary stress ed that t he comprehensiv e revitalization in Northe ast China, needs a hig h quality, soli d style, ca dres of the dare t o play. Cadr e cadre s is a pledge, shoul d want to do w ork and able t o do good, ent husias m is paramount. Treat party cadre s, it is nece ssary to Strict ma nagement, a nd warm care, enable t he br oad mass es of ca dres w ork hard work, this is tw o parallel principle s. I n strict a ccor dance wit h the sta ndar ds of good cadres sele ction and appointme nt, the real officers, dare officers, those w ho wa nt to play, good as excell ent ca dres at all levels of leaders hip i n the pa st. At prese nt, some lea ding cadres w ork initiative i s not high, beyond political , idle , lazy governance governance, not as, sl ow, mes sy and a phenomenon still exist to varyi ng degree s, affected and restricte d economi c and social development. We m ust mobilize the enthusiasm of cadres a s an urge nt task, adhere to combi nation of incentives a nd constraints, a nd a dhere to the stri ct management a nd warm care, pra ctical s oluti on "for the officer s not to" pr obl em, motivate cadres a nd better lead the masses to a n undertaki ng, the cadres a nd create the new achieveme nt in a dare t o play, g ood at shows as new. To ide ntify the problem, accurate puls e

relationship betwee n Gover nment a nd busi nes s. The "two sessi ons", General Secretary of "Pro", "clear" the w ord s uccinctly sum marize d the new relations hip betwee n Gover nment and busi ness , as pure politics , resha ping the political relati ons hip spe cified in t he dire ction. Distri ct leader s in ha ndl ing politi cal and busi ness relati ons, engage i n trading power for money, a nd finally stumble d, we a le sson, always kee p i n mind that "Pro", "cle an" practi cing "Pr o", "clear". "Pro" is to ope n a sincere e ngagement with private enterpri se to help s olve pra ctical difficulties ; " Clear "is to clarify the Divis ion of power, exercise d in a ccor dance wit h, private entre preneurs wit h innocent purity, not abusi ng power for pers onal gain, not to engage i n trading power for money. Thir d, in or der to maintai n fairnes s and j usti ce. Fairne ss and justice is t he lifeline of the rule of la w, is the best development envir onment. Curre ntly, lax law e nforceme nt and t he judicia l sect or in our region als o exist to varying degrees, law e nforceme nt de partments and individual wi ndow units power for pers ona l gains a nd br ibe s, thick frie nds , relations, human cases, m oney cases i n whi ch s eriously infringe on t he legitimate rights a nd intere sts of enter prises a nd people. E spe cially s ome law enfor cement a nd inspe ction for profit purposes , deli berately looking for corporate loopholes, found dire ctly under the ti cket does not give busine ss improveme nt opport unitie s. We re cruit a company doe sn't easil y, cultivating a busi ness mor e difficult, never for pers ona l gain, systematic harassme nt, car d, last checke d to check t o get the enter prise colla pse d. To guarantee t he legitimate rights a nd intere sts. Always proceed from the overall situati on of reform and devel opme nt of service s, fully consi der the characteri stics of producti on a nd ma nagement in non-public e nterpris es and social benefits, a n accurate gras p of legal limits, prote ct the e nthusiasm of entre preneurs a nd pra ct itioners in i nnovation and entrepre ne urshi p, enha nci ng expectati ons a nd confidence. To promote stri ct enforcem ent. Strengthe ning la w enforcement pr oce dures, im prove law e nforceme nt performance eval uation, strengtheni ng the s upervi sion of law enfor cem ent, exploration and practi ce of risk contr ol mechanism of law enforceme nt to further sta ndar dize the social se curit y, ur ban

management, roa d traffic administrative law enfor cement, effectively free, extensive law-enforcement and lax enforcement of law enfor cement a nd ot her is sues . To uphol d justi ce. Justice i s the last li ne of Defens e to safeguar d fairness a nd j ustice, to unequivocally s upport the courts and procuratorates inde pendently exerci se level .. . Judi cial activitie s were rampant, m ust not be all ow ed to r un, favors, m one y, must not be all owed t o knowingly violate the miscarriage, violati ons of the legitimate rights a nd intere sts of the mass es must not be all owe d to abuse of powe r, to make forest mass ca n be felt in every judicial case s in e quity a nd j ustice . Four to dee pen gras s-roots gover nance accor ding to la w

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在图 5(甲)中,LC 振荡电路中规定图示电流方向为电流 i 的方向,则振荡电流随 时间变化的图像如图 5(乙)所示

例3

那么,电路中各物理量在一个周期内的情况是 _______时刻,电容器上带电量为零 _______时刻,线圈中的磁场最强 _______时刻,电容器两板间的电场强度值最大 _______时刻,电路中电流达到反向最大值 _______时间内是对电容器的充电过程 解析 分析这类问题的关键是要搞清电场能和磁场能相互转化的过程,以及它所对应的 物理状态和物理量间的关系,由题图可知电容器 C 正在放电,当 t=0 时,C 带电量最多,两 板间电压最大,电场能也最大,而此时磁场能最小(为零),对应的电流 i 最小(为零),随着 C 放电的持续,带电量、电压、电场能将逐渐减小,而磁场能、电流 i 将逐渐变大,磁场能、 电流达到最大之后由于电感 L 和电容 C 的作用,将对电容反向充电,直至最大,依此类推, 故可得知,A、C 时刻电流最大,磁场最强,电场为零,C 带电量为零,当电流为零时(对应图 中的 O、B、D)电容器上带电量最多,相应的电场强度值为最大,同理可知 C 时刻电流达到最 大,电容经过 T/4 放电完毕后,紧接着又对电容反向充电,又经 T/4,充电到最大值,即带 电量、电压、电场能达最大,磁场能、电流变为零,这个过程对应着图中的 A→B,类似的道 理可知 C→D 也是对电容的充电过程。 六、总结、扩展 1.LC 振荡电路的周期公式,频率公式要理解其物理含义,它只由电路本身的特性(L、C

值)决定,所以叫做固有周期和固有频率,应用中,通过改变 LC 回路中的电感 L 或电容 C, 周期和频率也随之改变,满足各种需要。

Grass-r oots gov erna nce a ccordi ng to law is a n importa nt foundation for prom oting the construction of rule of law, but als o the most basi c devel opme nt environment. Des pite my good social order in Ge neral, but ther e are law-a bidi ng consci ous nes s, social order is not sta ndard, regardle ss of faith, Twining visit vis it and other outsta ndi ng problems. We want to a ctively pr omote the fiel d of multi-lev el governa nce accordi ng to la w, pr omote the conti nuous improveme nt of the s ocial e nvironment. To pr omote universal complia nce. Actively fost er t he rule of law cult ure, carry out law publicity a nd educati on on honesty and trustw orthiness, g uide t he masse s and cons ciously a bide by the la w, failing to find method, probl em-s olving method, method of gradual ly cha nging t he worl d, he is not looking for but some one " uns poke n rule s", formed all law la w, abi de by t he good atmos phere. To strengthe n the compre hensive manageme nt of pu blic security. Deepeni ng pea ce xinga n construction, strongly against vi olence crime, mafia and s erious crimi nal offences, to protect t he legitimate rights a nd intere sts of citize ns, l egal pers ons, carry out crimi nal policy of temper 。 计 设 材 驭 驾 度 高 论 从 据 依 和 想 思 导 指 学 教 题 为 作 ) 维 三 ( 目 中 程 把 要 是 就 课 .说 准 标 量 质 后 用 使 付 ; 续 手 面 书 理 办 方 甲 时 管 接 交 移 在 并 , 收 验 工 竣 的 业 物 本 与 参 justice with mercy, the maximum stimulati ng s ocial vitalit y, and earne stly safeguard social harm ony and sta bility. To res olve s ocial conflicts by law. To furt her smooth cha nnel s of reporting s ocial conditi ons and public opi nion, impr oving regul ation, arbitration, as wel l as di spute resol ution mechani sms, implement fully t he petiti oners ' case s "third -party" heari ngs a nd s upervi sing sy stem of letters and calls, and t o resolv e the inv olved law l awsuit into the orbit of rule of la w, vexatious, Twini ng visit visit, distur bing social or der and other malici ous extorti on, re sol utely crack down. Five , improv ing cadre s V itale, provi de strong prote ction for forest devel opme nt XI General Se cretary stress ed that t he comprehensiv e revitalization in Northe ast China, needs a hig h quality, soli d style, ca dres of the dare t o play. Cadr e cadre s is a pledge, shoul d want to do w ork and able t o do good, ent husias m is paramount. Treat party cadre s, it is nece ssary to Strict ma nagement, a nd warm care, enable t he br oad mass es of ca dres w ork hard wor k, this is tw o parallel principle s. I n strict a ccor dance wit h the sta ndar ds of good cadres sele ction and appointme nt, the real officers, dare officers, those w ho wa nt to play, good as excell ent ca dres at all levels of leaders hip i n the pa st. At prese nt, some lea ding cadres w ork initiative i s not high, beyond political , idle , lazy governance governance, not as, sl ow, mes sy and a phenom enon still exist to varyi ng degree s, affected and restricte d economi c and social development. We m ust mobilize the enthusiasm of cadres a s an urge nt task, adhere to combi nation of incentives a nd constraints, a nd a dhere to the stri ct management a nd warm care, pra ctical s oluti on "for the officer s not to" pr obl em, motivate cadres a nd better lead the masses to a n undertaki ng, the cadres a nd create the new achieveme nt in a dare t o play, g ood at shows as new. To ide ntify the problem, accurate puls e

relationship betwee n G overnment a nd busines s. T he "two se ssions", Ge neral Se cretary of "Pro", "clear" the w ord s uccinctly sum marize d the new relati ons hip betwee n G overnment a nd busine ss, as pure politi cs, res haping the politi cal relati ons hip spe cified i n the direction. Di strict lea ders in handling pol itical a nd busi nes s relations, e ngage in tradi ng power for money, a nd finally stumble d, we a le ss on, alway s keep i n mind t hat "Pro", "clea n" practicing "Pro", "cle ar". "Pro" is to ope n a sincere e ngagement wit h private enter prise t o hel p solv e practi cal difficulties; " Cle ar "is to clarify the Div ision of pow er, exerci sed i n accordance wit h, private entre prene urs wit h innocent purity, not a busing power for personal gain, not to engage i n trading power for money. Thir d, in order to mai ntain fairne ss and justice . Fairness a nd justi ce is the lifeline of the rule of law, is t he be st devel opme nt environment. Curre ntly, lax law e nforceme nt and the j udi cial se ctor i n our regi on al so exist t o varying degre es, law e nforceme nt de partments a nd i ndivi dual wi ndow units power for pers onal gai ns and bri bes, t hick frie nds , relations, human cases , money case s in w hich seri ously infringe on the legitimate right s and interests of enter prises a nd people. E specially some law e nforceme nt and inspe ction for profit purpose s, del iberately l ooki ng for cor porate l oopholes, found dire ctly under t he ticket does not give busi nes s improveme nt opportunitie s. We re cruit a com pany doesn't easil y, cultivating a busine ss more difficult, never for per sonal gain, sy stematic hara ssment, card, la st checke d to check t o get the e nterpri se collapsed. To g uarantee t he legitimate rights a nd i nterests. Al ways pr ocee d from the overall situati on of reform and development of service s, fully consider the characteristi cs of producti on a nd ma nagement i n non -publi c enter prises a nd social benefits, a n accurate gras p of legal limits, protect t he ent husiasm of entre preneurs a nd practiti oners i n innovati on a nd e ntrepre neur shi p, enhancing ex pectati ons and confide nce . To prom ote strict e nforcement. Strengthe ning l aw enfor cement procedure s, impr ove law e nforcement performance eval uation, strengt heni ng t he supervisi on of law enforcement, expl oration and practi ce of risk control me cha nism of law e nforceme nt to further standardize t he s ocial security, urba n management, roa d traffic administrative law enfor cement, effectively free, extensive law-enforcement and lax enforcement of law enfor cement a nd ot her is sues . To uphol d justi ce. Justice i s the last li ne of Defens e to safeguar d fairness a nd j ustice, to unequivocally s upport the courts and procuratorates inde pendently exerci se level .. . Judi cial activitie s w ere rampant, m ust not be all owed to r un, favors, m one y, must not be all owed t o knowingly violate the miscarriage, violati ons of the legitimate rights a nd intere sts of the mass es must not be all owe d to abuse of powe r, to make forest mass ca n be felt in every judicial case s in e quity a nd j ustice . Four to dee pen gras s-roots gover nance accor ding to la w

2.应用周期公式、频率公式进行计算时,要特别注意各个物理量的单位,常用电容器的 单位有微法(μ F)和皮法(pF),代入公式时一定要换为法(F),电感 L 的单位有时是毫亨或微 亨(mH 或μ H),代入公式时要换为亨(H),这样得到的周期和频率的单位才是正确的(秒和赫) 七、板书设计

电磁振荡和频率固有周期
定义

电磁振荡完成一次周期性变化的时间

决定因素 由电容 C 和电感 L 决定与电容器带电多无关单位 秒 固有频率 定义

一秒钟完成周期性变化的次数

决定因素 单位

L↓、C↓、T↓

f↑



Grass-r oots gov erna nce a ccordi ng to law is a n importa nt foundation for prom oting the construction of rule of law, but als o the most basi c devel opme nt environment. Des pite my good social order in Ge neral, but ther e are law-a bidi ng consci ous nes s, social order is not sta ndard, regardle ss of faith, Twining visit vis it and other outsta ndi ng problems. We want to a ctively pr omote the fiel d of multi -lev el governa nce accordi ng to la w, pr omote the conti nuous improveme nt of the s ocial e nvironment. To pr omote universal complia nce. Actively foster t he rule of law cult ure, carry out law publicity a nd educati on on honesty and trustw orthiness, g uide t he masse s and cons ciously a bide by the la w, failing to find method, probl em-s olving method, method of gradual ly cha nging t he worl d, he is not looking for but some one " uns poke n rule s", formed all law la w, abi de by t he good atmos phere. To strengthe n the compre hensive manageme nt of public security. Deepeni ng pea ce xinga n construction, strongly against vi olence crime, mafia and s erious crimi nal offenc es, to protect t he legitimate rights a nd intere sts of citize ns, l egal pers ons, carry out crimi nal policy of temper 。 计 设 材 驭 驾 度 高 论 从 据 依 和 想 思 导 指 学 教 题 为 作 ) 维 三 ( 目 中 程 把 要 是 就 课 .说 准 标 量 质 后 用 使 付 ; 续 手 面 书 理 办 方 甲 时 管 接 交 移 在 并 , 收 验 工 竣 的 业 物 本 与 参 justice with mercy, the maximum stimulati ng s ocial vitalit y, and earne stly safeguard social harm ony and sta bility. To res olve s ocial conflicts by law. To furt her smooth cha nnel s of reporting s ocial conditi ons and public opi nion, impr oving regul ation, arbitration, as wel l as di spute resol ution mechani sms, implement fully t he petiti oners ' case s "third -party" heari ngs a nd s upervi sing sy stem of letters and calls, and t o resolv e the inv olved law l awsuit into the orbit of rule of la w, vexatious, Twini ng visit visit, distur bing social or der and other malici ous extorti on, re sol utely crack down. Five , improv ing cadre s V itale, provi de strong prote ction f or forest devel opme nt XI General Se cretary stress ed that t he comprehensiv e revitalization in Northe ast China, needs a hig h quality, soli d style, ca dres of the dare t o play. Cadr e cadre s is a pledge, shoul d want to do w ork and able t o do good, ent husias m is paramount. Treat party cadre s, it is nece ssary to Strict ma nagement, a nd warm care, enable t he br oad mass es of ca dres w ork hard work, this is tw o parallel principle s. I n strict a ccor dance wit h the sta ndar ds of good cadres sele ction and appointme nt, the real officers, dare officers, those w ho wa nt to play, good as excell ent ca dres at all levels of leaders hip i n the pa st. At prese nt, some lea ding cadres w ork initiative i s not high, beyond political , idle , lazy governance governance, not as, sl ow, mes sy and a phenomenon still exist to varyi ng degree s, affected and restricte d economi c and social development. We m ust mobilize the enthusiasm of cadres a s an urge nt task, adhere to combi nation of incentives a nd constraints, a nd a dhere to the stri ct management a nd warm care, pra ctical s oluti on "for the officer s not to" pr obl em, motivate cadres a nd better lead the masses to a n undertaki ng, the cadres a nd create the new achieveme nt in a dare t o play, g ood at shows as new. To ide ntify the problem, accurate puls e



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