题目内容
如图所示,平行板电容器两极板M、N相距d,两极板分别与电压恒定为U的电源两极连接,极板M带正电。现有一质量为m的带电油滴在极板中央处于静止状态,且此时极板带电荷量与油滴带电荷量的比值为k,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039428862480.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039428862480.jpg)
A.油滴带负电 |
B.油滴带电荷量为![]() |
C.电容器的电容为![]() |
D.将极板N向下缓慢移动一小段距离,油滴将向上运动 |
AC
试题分析:由题意知,极板M带正电,板间电场向下,又油滴在极板中央处于静止状态,可知受电场力竖直向上,与电场反向,故油滴带负电,所以A正确;根据平衡条件
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003942933738.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003942964745.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003942980988.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003942995995.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039430111018.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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