题目内容
(8分)如图所示,在匀强电场中,有A、B两点,它们间距为2cm ,两点的连线与场强方向成60°角。将一个电量为?2×10?5C的电荷由A移到B,其电势能增加了0.1J 。则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006271597435.png)
(1)在此过程中,电场力对该电荷做了多少功?
(2)A、B两点的电势差
为多少?
(3)匀强电场的场强为多大?
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006271597435.png)
(1)在此过程中,电场力对该电荷做了多少功?
(2)A、B两点的电势差
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000627175455.png)
(3)匀强电场的场强为多大?
(1)
,(2)
,(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000627221805.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000627190571.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000627206578.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000627221805.png)
试题分析:(1)由功能关系知:电场力对该电荷做功
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000627237822.png)
(2)根据公式可得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006272371380.png)
(3)根据公式可得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006272531353.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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