题目内容
如图,在光滑绝缘水平面上,三个带电小球a、b和c分别位于边长为l的正三角形的三个顶点上;a、b带正电电荷量均为q,c带负电。整个系统置于方向水平的匀强电场中。已知静电力常量为k,若三个小球均处于静止状态,则匀强电场场强的大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005078951504.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005078951504.png)
A.![]() | B.![]() | C.![]() | D.![]() |
B
试题分析:以任一小球(如c)为研究对象进行受力分析,如图所示:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005079732376.png)
设小球间的作用力为F,匀强电场的场强大小为E,根据受力情况可知:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250005079891031.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000508005760.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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