题目内容
如图所示,边长为L的正方形导线框质量为
,由距磁场H高处自由下落,其下边
进入匀强磁场后,线圈开始做减速运动,直到其上边
刚穿出磁场时,速度减为
边刚进入磁场时的一半,磁场的宽度边也为L,则线框穿过匀强磁场过程中发出的焦耳热为 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413312477915482.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133124326337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133124435370.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133124498367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133124435370.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413312477915482.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
B
线框进入磁场前做自由落体运动,设进入磁场速度为v,
,
刚穿出磁场时速度为v/2,从刚进入磁场到完全穿出过程中,
,Q=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133124841836.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133125184786.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133124498367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241331252621410.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133124841836.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.![]() | B.![]() |
C.![]() | D.![]() |