题目内容
如图所示,A、B、C、D、E是半径为r的圆周上等间距的五个点,在这些点上各固定一个点电荷,除A点处的电量为-q外,其余各点处的电量均为+q,则圆心O处( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009526112645.jpg)
A.场强大小为
,方向沿AO方向
B.场强大小为
,方向沿OA方向
C.场强大小为
,方向沿AO方向
D.场强大小为
,方向沿OA方向
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009526112645.jpg)
A.场强大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000952627525.png)
B.场强大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000952627525.png)
C.场强大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000952674597.png)
D.场强大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000952674597.png)
D
试题分析:由点电荷的场强公式可知,各点电荷在O点产生的场强大小为E=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000952627525.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000952627525.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000952627525.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000952627525.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000952674597.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500095279911505.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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