题目内容
如图所示,一带电小球质量为
,用丝线悬挂于O点,在竖直面内摆动,最大摆角为600,水平磁场垂直于小球摆动的平面,当小球自左方摆到最低点时,悬线上的张力恰为零,则小球自右方摆到最低点时悬线上的张力为 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019233702646.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001923354339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019233702646.jpg)
A.0 | B.![]() | C.![]() | D.![]() |
C
试题分析:带电粒子在磁场中收到洛伦兹力作用,但是洛伦兹力不做功,所以从左方摆到最低点的过程只有重力做功,根据动能定理
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019234321130.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001923448940.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001923463981.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001923479572.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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