题目内容
在电场中把一个电荷量为-6×10-8C的点电荷从A点移到B点,电场力做功为-3×10-5J,将此电荷从B 点移到C点,电场力做功为4.5×10-5J,求:
(1)A与C两点间的电势差。
(2)取C点为电势零点时,B的电势为多大?
(1)A与C两点间的电势差。
(2)取C点为电势零点时,B的电势为多大?
(1)-250V(2)-750V
(1)
;![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241328317591476.png)
则![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241328317901044.png)
(2)因
,若取C点为电势零点时,则B的电势为-750V。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241328317271394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241328317591476.png)
则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241328317901044.png)
(2)因
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132831852714.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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