题目内容
静电场在x轴上的场强E随x的变化关系如图所示,x轴正向为场强正方向,带正电的点电荷沿x轴运动,则点电荷
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500494996111485.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500494996111485.png)
A.在x2和x4处电势能相等 |
B.由x1运动到x3的过程电势能增大 |
C.由x1运动到x4的过程电场力先增大后减小 |
D.由x1运动到x4的过程电场力先减小后增大 |
BC
试题分析:正点电荷受力方向与电场C方向相同,在0~x1电场力为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004949977275.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004949992431.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004950008525.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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