题目内容
点电荷A、B周围电场线分布如图,c、d是同一电场线上两点,下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030170424343.png)
A.点电荷A可能带负电
B.c点电场强度与d点电场强度相同
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003017058332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003017058332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003017058332.jpg)
C.c点电势高于d点电势
D.电子从c运动到d过程中电势能保持不变
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030170424343.png)
A.点电荷A可能带负电
B.c点电场强度与d点电场强度相同
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003017058332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003017058332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003017058332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003017058332.jpg)
D.电子从c运动到d过程中电势能保持不变
C
试题分析:从图中可以看出,这是等量异种电荷间的电场分布情况,A的电场线是出来的,故A是带正电的,A不对;c点离点电荷较近一些,其周围的电场线比d点密,故c点电场强度大于d点电场强度,B也不对;
又因为c、d处于同一条电场线上,且电场线的方向是由c到d,故c点电势高于d点电势,C是正确的;c、d两点的电势不相同,故电子从c运动到d过程中,电场力要做功,其电势能要发生改变,故D是不对的。
![](http://thumb2018.1010pic.com/images/loading.gif)
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