题目内容
如右图所示的电路中,C为平行板电容器,闭合开关S,给电容器充电,当电路中电流稳定之后,下列说法正确的是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242146135653443.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242146135653443.jpg)
A.若变阻器![]() |
B.保持开关S闭合,不论变阻器![]() ![]() |
C.保持开关S闭合,将电容器上极板与下极板稍微拉开一些的过程中,![]() |
D.断开开关S,若此时刚好有一电荷静止在两平行板电容器之间,将电容器上极板与下极板稍微错开一些的过程中,油滴将向下运动 |
A
试题分析:若变阻器
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824214613596327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824214613596327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824214618651365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824214618651365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824214618651365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824214615219361.png)
故选A
点评:本题的D选项需要知道断开开关S,两极板间的电压恒定,两极板间的电场强度与极板间的距离无关,
![](http://thumb2018.1010pic.com/images/loading.gif)
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