题目内容
如图所示,一质量为m、电量为q的带电小球,以初速度v0从a点竖直向上射入匀强电场中,匀强电场方向水平向右.它通过电场中的b点时,速率为2v0,方向与电场方向一致,则a、b两点间的电势差为:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014338802819.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014338802819.jpg)
A.mv![]() | B.3mv![]() | C.2mv![]() | D.3mv![]() |
C
试题分析:粒子,从A到B,根据动能定理得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014339421370.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001433958845.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001433973890.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.mv![]() | B.3mv![]() | C.2mv![]() | D.3mv![]() |