题目内容
右图为电场的电场线,现将一电荷量q=-3.0×10-9 C的负电荷从A点移到B点、从B点移到C点,从C点移到D点电场力做功分别为:WAB=3.0×10-8 J、WBC=1.5×10-8 J、WCD=9.0×10-9 J.若C点电势为零,则A、B、D三点电势分别为 、 、 。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241508276141264.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241508276141264.png)
φA=-15 V φB=-5 V φD=3 V
试题分析:根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150827801619.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150827910591.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241508280501086.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241508281601152.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241508282691078.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150828316550.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150828456926.png)
点评:本题易错的地方在于:在使用公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150828612585.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150828706557.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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