题目内容
如图所示,两个相同的平行板电容器C1、C2用导线相连,开始时都不带电。现将开关S闭合给两个电容器充电,充电完毕后,电容器C1两板间有一带电微粒恰好处于平衡状态。再将开关S断开,把电容器C2两板稍错开一些(两板间距离保持不变),重新平衡后,下列判断正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241954004062165.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241954004062165.jpg)
A.电容器C1两板间电压减小 |
B.电容器C2两板间电压增大 |
C.带电微粒将加速上升 |
D.电容器C1所带电荷量增大 |
BCD
试题分析:当断开开关S时,则电容器两极板间的电量不变.若把电容器
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195400453372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195400453372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195400453372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195402902339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195402902339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195403994526.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195404727592.png)
故选BCD.
点评:本题关键是电容器两端电压发生变化导致电容器电量和电场强度的变化,从而引起电场力变化.
![](http://thumb2018.1010pic.com/images/loading.gif)
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