题目内容
如图7-2-16所示,U=10V,电阻R1=3Ω,R2=2Ω,R3=5Ω,电容器的电容C1=4μF,C2=1μF,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241205114041759.gif)
(1)当K闭合时间足够长时,C1和C2所带的电量各是多少?
(2)然后把K断开,K断开后通过R2的电量是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241205114041759.gif)
(1)当K闭合时间足够长时,C1和C2所带的电量各是多少?
(2)然后把K断开,K断开后通过R2的电量是多少?
(1)1.6
10-5C,1
10-5C (2)2.6
10-5C
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
(1)K闭合足够长时间后,电路达到稳定,R3两端电压为零,所以UC1=UR2=
=4V,Q1=C1UC1=4
10-6
4=1.6
10-5C
UC2=U=10V
Q2=C2UC2=1
10-6
10=1
10-5C
(2)K断开后,C1C2将通过R1R2R3放电,至放电结束,通过R2的电量
Q=Q1+Q2=1.6
10-5+1
10-5=2.6
10-5C
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511451526.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
UC2=U=10V
Q2=C2UC2=1
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
(2)K断开后,C1C2将通过R1R2R3放电,至放电结束,通过R2的电量
Q=Q1+Q2=1.6
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120511404132.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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