题目内容
如图,在点电荷Q的电场中,有
两点。
点场强大小为
,方向与
连线成
角;
点的场强大小为
,方向与
连线成60°角。关于
两点场强大小及电势高低,下列说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241323130813947.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132312722410.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132312738287.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132312800390.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132312863380.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132312894385.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132312925308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132312956392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132312863380.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132312722410.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241323130813947.png)
A.![]() ![]() ![]() | B.![]() ![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
A
a点电场线与b点电场线方向相交于O点,则该场源电荷位于O点处,三角形Oab为直角三角形,设ab间的距离为d则
,
,所以根据公式
可得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132313705458.png)
,该场源电荷为负电荷,所以距离场源电荷越近,电势越低,故
,A正确。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241323135651025.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132313596975.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132313658674.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132313705458.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132313752556.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132313799481.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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