题目内容
如图,在点电荷Q产生的电场中,将两个带正电的试探电荷
、
分别置于A、B两点,虚线为等势线。取无穷远处为零电势点,若将
、
移动到无穷远的过程中外力克服电场力做的功相等,则下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241510260963471.jpg)
A.A点电势大于B点电势
B.
的电荷量小于
的电荷量
C.A、B两点的电场强度相等
D.
在A点的电势能小于
在B点的电势能
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025565342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025706367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025565342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025706367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241510260963471.jpg)
A.A点电势大于B点电势
B.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025565342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025706367.png)
C.A、B两点的电场强度相等
D.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025565342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025706367.png)
B
试题分析:A、将
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025565342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025706367.png)
B、将
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025565342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025706367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025565342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025706367.png)
C、根据点电荷电场线分布情况,越靠近点电荷,场强越强;错误
D、由于
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025565342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025706367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025565342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151025706367.png)
故选B
点评:中等难度。克服电场力做功相等,电势能增加量就相同,取无穷远处为零电势点,则一开始的电势能就相同。
![](http://thumb2018.1010pic.com/images/loading.gif)
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