题目内容
如图所示,匀强电场中有A、B、C三点构成等边三角形,边长均为4 cm,将一带电荷量q=1.0×10-10 C的正电荷(不计重力),从A点移到C点,电场力做功为-
×10-9 J,若把同一电荷从A点移到B点,电场力做功也为-
×10-9 J,那么该电场的场强是 。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241508291112164.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150828815344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150828815344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241508291112164.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150829408784.png)
试题分析:从A移动到B点和从A移动到C点,两种情况下,电场力做功相同,所以BC两点是等式点,将AB投影到电场线上可得AB两点沿电场线的距离为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150829548926.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150829657591.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150829766971.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150829922598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150829408784.png)
点评:此类型题是一种非常容易出错的题目,最容易在正负号上面出错,再一个在使用公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150829922598.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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