题目内容
如图所示,在圆心处固定一正点电荷Q,大圆半径是小圆半径的2倍,一检验电荷q在Q的电场中由点M向点R运动.其运动轨迹为曲线MNR,下列说法中正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020125882265.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020125882265.jpg)
A.N点的电势高于M点电势 |
B.N点电场强度是M点电场强度的2倍 |
C.检验电荷q在N点的加速度是在M点加速度的4倍 |
D.检验电荷q在M点的电势能小于在R点的电势能 |
ACD
试题分析:由正点电荷的电场线及等势面特点可知
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002012603616.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002012603679.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002012619693.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002012650897.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002012666605.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002012681671.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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