题目内容
如图所示,在光滑的水平面上宽度为L的区域内,有一竖直向下的匀强磁场.现有一个边长为a (a<L)的正方形闭合线圈以垂直于磁场边界的初速度v0向右滑动,穿过磁场后速度减为v,那么当线圈完全处于磁场中时,其速度大小( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048101992556.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048101992556.png)
A.大于![]() | B.等于![]() | C.小于![]() | D.以上均有可能 |
B
试题分析:对线框进入或穿出磁场的过程,由动量定理可知
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004810464807.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004810636823.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004810651901.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004810667624.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004810683480.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004810698598.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.大于![]() | B.等于![]() | C.小于![]() | D.以上均有可能 |