题目内容
如图所示,电源电动势E=6V,电源内阻不计.定值电阻R1=2.4kΩ、R2="4.8kΩ." ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241214096834159.jpg)
⑴若在ab之间接一个C=100μF的电容器,闭合开关S,电路稳定后,求电容器上所带的电量;
⑵若在ab之间接一个内阻RV = 4.8kΩ的电压表,求电压表的示数.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241214096834159.jpg)
⑴若在ab之间接一个C=100μF的电容器,闭合开关S,电路稳定后,求电容器上所带的电量;
⑵若在ab之间接一个内阻RV = 4.8kΩ的电压表,求电压表的示数.
1)Q=4×10-4C
2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412140969872.gif)
=3V
2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412140969872.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121409698326.gif)
解析:⑴设电容器上的电压为Uc.
电容
器的带电量
解得: Q=4×10-4C
⑵设电压表与R2并联后电阻为R并
则电压表上的电压为:
解得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412140979272.gif)
=3V
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121409714597.gif)
电容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412140969872.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121409745428.gif)
⑵设电压表与R2并联后电阻为R并
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121409761615.gif)
则电压表上的电压为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121409776626.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412140979272.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121409698326.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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