题目内容
两个较大的平行金属板
、
相距为
,分别接在电压为
的电源正、负极上,这时质量为
,带电量为
的油滴恰好静止在两板之间,如图所示,在其他条件不变的情况下,如果将两板非常缓慢地水平错开一些,那么在错开的过程中( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241458228783110.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145822457300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145822520309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145822582321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145822629321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145822738337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145822800322.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241458228783110.jpg)
A.油滴将向上加速运动,电流计中的电流从![]() ![]() |
B.油滴将向下加速运动,电流计中的电流从![]() ![]() |
C.油滴静止不动,电流计中的电流从![]() ![]() |
D.油滴静止不动,电流计中的电流从![]() ![]() |
D
试题分析:根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145823596783.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145823643598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145823705575.png)
点评:在研究电容器的动态变化时,需要先看看电容器是否和电源相连,若相连,则电容器两端的电压不变,若不连 ,电容器所带电荷量不变,然后根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145823596783.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145823643598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145823705575.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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