题目内容
图18中电源电动势E=10V,C1=C2=30μF,R1=4.0Ω, R2=6.0Ω,电源内阻可忽略。先闭合电键K,待电路稳定后,再将K断开,则断开K后流过电阻R1的电量为多少.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241158196101948.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241158196101948.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241158196261007.jpg)
当K闭合,待电路稳定后,电容C1和C2分别充得的电量为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115819641875.gif)
Q20=0
当K断开,待电路稳定后,电容C1和C2分别充得的电量为:
Q1=C1E=
, Q2=C2E=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115819672435.gif)
故断开K后流过电阻R1的电量为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241158197661003.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115819641875.gif)
Q20=0
当K断开,待电路稳定后,电容C1和C2分别充得的电量为:
Q1=C1E=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115819672435.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115819672435.gif)
故断开K后流过电阻R1的电量为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241158197661003.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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