题目内容
如下图所示,平行带电金属极板A、B间的匀强电场场强E=1.2×103V/m,两极板间的距离d=5cm,电场中C点和D点分别到A、B极板的距离均为0.5cm,C、D间的水平距离L=3cm,B板接地,求:
(1)C、D两点间的电势差UCD;
(2)一带电量q=-2×10—3C的点电荷从C沿直线运动到D的过程中,电荷的电势能变化了多少?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125726417889.gif)
(1)C、D两点间的电势差UCD;
(2)一带电量q=-2×10—3C的点电荷从C沿直线运动到D的过程中,电荷的电势能变化了多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125726417889.gif)
解:
(1)过C作CM垂直于B板,过D作DM平行于B板,
AM与DM相交于点M。故
,
(1′).
(2′)
(1′),故
=-48V。(1′)
(2)
(2′)
(1′)
=
(2′)
(1)过C作CM垂直于B板,过D作DM平行于B板,
AM与DM相交于点M。故
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125726448409.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125726448449.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125726463502.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125726479848.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125726448449.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125726510500.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125726526764.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125726541484.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125726557365.gif)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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