题目内容
在x轴上固定两个点电荷Q1=2q、Q2=q,E1表示Q1激发的电场中某点的场强,E2表示Q2激发的电场中某点的场强,则下列说法正确的是( )
A.E1和E2相同的点共有一处,其合场强为2E2 |
B.E1和E2相同的点共有一处,其合场强为零 |
C.E1和E2相同的点共有三处,两处合场强为零,一处合场强为2E2 |
D.E1和E2相同的点共有两处,一处合场强为零,另一处合场强为2E2 |
A
试题分析:正电荷的电场线从正电荷指向无穷远,在x轴上固定两个点电荷形成的电场如下图所示,在两个电荷中间部分,电场线方向相反,所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224276351.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224323372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224338673.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224276351.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224276351.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224323372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224276351.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224416460.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224432419.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224447399.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032244796950.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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