题目内容
X轴上有两点电荷Q1和Q2,Q1和Q2之间连线上各点电势高低如图曲线所示(AP>PB),选无穷远处电势为0,从图中可以看出( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241519449362884.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241519449362884.jpg)
A.Q1电量一定小于Q2电量 |
B.Q1和Q2一定同种电荷 |
C.P点电场强度是0 |
D.Q1和Q2之间连线上各点电场方向都指向Q2 |
D
试题分析:由图象可以发现,离
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151944951362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151944951362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151945107383.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151945107383.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151945107383.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151944951362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151945107383.png)
由于
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151944951362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151945107383.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151944951362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151944951362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151945107383.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151945107383.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151944951362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151945107383.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151944951362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151945107383.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151945107383.png)
点评:选无穷远处电势为0,则在正电荷的电场中所有点的电势都是正的,在负电荷的电场中所有点的电势都是负的,如果是等量异种电荷的话,在中垂线上的点电势为零.
![](http://thumb2018.1010pic.com/images/loading.gif)
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