题目内容
如图所示,在
平面内有一个以
为圆心、半径R=0.1m的圆,P为圆周上的一点,O、P两点连线与
轴正方向的夹角为
. 若空间存在沿
轴负方向的匀强电场,场强大小E=100V/m,则
、
两点的电势差可表示为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241540066984839.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154005076465.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154005560292.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154005762266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154005778297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154005856310.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154005560292.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154005996289.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241540066984839.jpg)
A.UOP=" -10sinθ" (V) | B.UOP=" 10sinθ" (V) |
C.UOP=" -10cosθ" (V) | D.UOP=" 10cosθ" (V) |
A
试题分析:在匀强电场中,两点间的电势差
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154006745534.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154006886721.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241540071511242.png)
故选A
点评:注意公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154006745534.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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