题目内容
(10分)如图所示,平行金属带电极板A、B间可看作匀强电场,场强
,极板间距离d=5cm,电场中C和D分别到A、B两板距离均为0.5 cm,B板接地,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241249216922094.jpg)
(1)C和D两点的电势、两点间的电势差
;
(2)点电荷
分别在C和D两点的电势能;
(3)将点电荷
从C匀速移到D时除电场力以外的力做功多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921677530.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241249216922094.jpg)
(1)C和D两点的电势、两点间的电势差
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921692224.gif)
(2)点电荷
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921708488.gif)
(3)将点电荷
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921724495.gif)
解:(1)B板接地,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921739258.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921755611.gif)
∴
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921770506.gif)
同理,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921786613.gif)
∴
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921802511.gif)
电势差:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921833671.gif)
(2)由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921848394.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921864819.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921895994.gif)
(3)将点电荷
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921911211.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921926473.gif)
∴
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124921942905.gif)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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