题目内容
如图所示,匀强电场场强为1×102N/C,ab=dc=4cm,bc=ad=3cm。则下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250013550673690.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250013550673690.jpg)
A.ab之间的电势差为-4V |
B.ac之间的电势差为5V |
C.将q=-5×10-3C的点电荷沿矩形路径abcda移动一周,电场力做功为0.04J |
D.将q=-5×10-3C的点电荷沿abc或adc从a移动到c,电场力做功都是-0.02J |
D
试题分析:沿电场线方向电势逐渐降低,所以a点电势大于b点电势,ab之间的电势差为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250013550831010.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250013550981091.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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