题目内容
如图所示,平行板电容器极板水平放置,板间有一质量为m的带电油滴悬浮在两板间静止不动,要使油滴向上运动,可采用的方法是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241526019572262.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241526019572262.png)
A.把电阻R1的阻值调大 | B.把电阻R2的阻值调大 |
C.把电阻R3的阻值调大 | D.把电阻R4的阻值调大 |
BD
试题分析:由图可知
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602066365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602175347.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602238361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602347327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602175347.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602597849.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602175347.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602238361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602175347.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602347327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602066365.png)
故选BD
点评:在直流电路中,电容器为断路,其两端电压为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602175347.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602597849.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152602175347.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.把电阻R1的阻值调大 | B.把电阻R2的阻值调大 |
C.把电阻R3的阻值调大 | D.把电阻R4的阻值调大 |