11-3ͼ
?11-3 11-3ͼʾ+qٶvO˶+qOľΪxO㴦
?뾶ΪaԲƽ棬ԲƽvֱͨԲλƵ ⣺11-3ͼʾqƽxʱͨԲƽĵλͨ
?D?(1?۴˽ϰ8-9(3)
q2xx?aqa2v22)
d?D ID??dt2(x2?a)322
11-4ͼ
-1511-4 11-4ͼʾƽаڸĽ糡ǿE=720sin10?tVm涨ͼ
(1)еλƵܶȣ
(2)ھr=10mһPt=0t=
-2
1?10?5sʱųǿȵĴС2(ǴĴų) ⣺(1) jD? jD??0?D,D??0E ?t?E???0(720sin105?t)?720?105??0cos105?t A?m?2 ?t?t???? (2) ?H?dl??I0??jD?dS
l(S)ȡ뼫ƽΪԲģ뾶rԲl?2?r
H2?r??r2jD
rH?jD
2t?0ʱHP?t?r?720?105??0?3.6?105??0A?m?1 21?10?5sʱHP?0 211-5 뾶ΪR=0.10mԲ幹ƽаУԵٳ磬
dE13-1-1
ʹ糡ı仯Ϊ=1.010 VmsλƵ
dtԲr(rR)ĴŸӦǿBrԼr=RĴŸӦǿBR
?D?E??0: (1) jD? ?t?tID?jDS?jD?R2?2.8A
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????(2) ?H?dl??I0??jD?dS
lSȡƽڼ壬ΪԲĵԲl?2?r
H2?r?jD?r2??0 H?dE2?r dtrdE?0 2dt??rdEBr??0H?00
2dtr?RʱBR??0?0RdE2dt?5.6?10?6 T
-2
-3
-1
*11-6 һߣ뾶Ϊ10mλȵĵΪ310mе25.1 AԼھർ߱ܽһ¸ (1)HĴС
(2)Eƽڵ߷ϵķ (3)ֱڵ߱S
: (1) Hdl?????I
ȡ뵼ͬĴֱڵߵԲl?2?r
H2?r?I IH??4?102A?m?1
2?r(2)ŷķʽ j??E
I/S?IR?7.53?10?2 V?m?1
?1/RS?????(3)S?E?H,Eص,Hֱ ??2Sֱ߲뵼ߣСS?EH?30.1W?m
*11-7 һԲε壬뾶ΪaΪ?,еI0
?E(1)ڵھΪrijĵĴСͷ
?(2)õHĴСͷ
?(3)õӡ͢ʸSĴСͷ
(4)(3)Ľ볤Ϊl뾶ΪrĵĵȽϣ
I:(1)ܶj0?0
Sŷķʽj0??E
E??jI0һ
??a2(2)ȡԵΪԲģֱڵߵƽԲl?2?r
???? ?H?dl??j0dSɵ E???j0??lSj0r2H2?r?I02
aI0r 22?a???(3) S?E?H
? Sֱڵ߲뵼ߣСΪ
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?I02rS?EH? 242?a(4)Ϊl뾶Ϊr(r?a)ڵλʱΪ
I0r22I0?lr2l W1?I01R?(2)?2?4a?r?aλʱ볤Ϊl뾶Ϊrڵ
2I0?lr2 W2?S2?rl?4?aW1?W2˵εĵǵų뵼ߵ
22*11-8 һܳ߹ܣÿλnѣ뾶Ϊaһӵĵi (1)߹ھΪrһĸӦ糡 (2)ӡʸĴСͷ : (1)߹ B??0ni
????B??dS ?E?dl???lS?tȡԹΪģֱƽԲl?2?rBϵ
?BE2?r???r2
?t???0nrdir?Bdi???0ʱEBϵ E??Բ
dt2?t2dt??di?0ʱEBϵ dt11-8ͼСΪ
??????(2) S?E?HEH֪Sָᣬͼʾ.
S?EH?Eni??0n2rdi2idt
-1
*11-9 һƽŲIJΪ3.0cm糡ǿȵΪ30VmʸõŲƵΪ
2
?ųǿȵΪ?һֱڴΪ0.5mȫ棬õŲƽѹǿǶ? : Ƶ??c??1.0?1010Hz
1E0H0ɵ 2B0??0H0??0?0E0?1.0?10?7T
ڵŲжֱ䵽һΪAȫձʱ?tʱյĵŶΪgAc?tǸñܵĵŲƽѹǿΪ
?r?0E??r?0HS?SEHP?gC??00?C2C?0E02?4.0?10?9 Pa
?02CɼŲķѹǿ(ѹ)Ǻģ
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ϰʮ
12-1 ijɫӿˮУƵʡ١Ƿ仯?仯?
?ս: ?䣬ΪԴƵʣ?n?Сu??n?С
n12-2 ˫ʵУµʱĻϵĸƽα仯?˵ɣ (1)ʹ֮ľС
(2)˫䣬ʹ˫ĻľС (3)װõĽṹ䣬ȫˮУ
(4)ԴƽS1S2߷Сƶ (5)һıĸƬסһ죮 : ?x?D?֪(1)Ʊ裻(2)Ʊܣ(3)Ʊܣ(4)㼶Ļd2?෴ƶ(5)㼶ƶ
12-3 ʲôǹ? ڲͬľýУɫͨĹʱ伸·Ƿͬ?ʱǷͬ?ڹ̲λĹϵʽ???в,Ϊʲô?
:??nrͬýȣ伸·̶ͬʱͬΪ?t???,ⲨIJҪ
? CΪ?Ѿڽе·Ϊߵ·̡
12-4 12-4ͼʾABƽ岣ɿ⣬ƽα仯?
(1) AشֱBķƽƣۼͼ(a)ݣ (2) Aʱתۼͼ(b)ݣ
12-4ͼ : (1)???2lek?k?2֪߷ƶƼ䣻
(2)߷ƶƱܣ 12-5 ƽȣΪ?ĵɫⴹֱʱ,۲쵽ĸ12-5ͼʾÿһƵֵĶǡڵֱֵ߲У˵ȱǰ?ȱݵij̶ȣ
: ȱǰģʸȺ(ȱݸ)߷⣬ÿһֵĶǡڵֱ߲У˵൱ƶһӦĿ϶ȲΪ?e??2Ҳǹȱݵij̶ȣ
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