题目内容
如图所示,水平放置的两个平行的金属板A、B带等量的异种电荷,A板带正电荷,B板接地。两板间有一正试探电荷固定在C点,以C表示电容器的电容,U表示两板间的电势差,
表示C点的电势,W表示正电荷在C点的电势能.若将B板保持不动,将正极板A缓慢向下平移一小段距离l(仍然在C上方)的过程中,各物理量与正极板移动距离x的关系图象中,正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027482803956.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027482966791.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002748264324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027482803956.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027482966791.png)
CD
试题分析:当将A板缓慢向下平移一小段距离l时,平行板之间的距离为d-x变小,由公式C=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002748311731.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002748327936.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027483421284.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027483581422.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027483741251.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002748405387.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027483421284.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002748436624.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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