题目内容
如图a、b两个带正电的粒子,以相同的速度先后垂直于电场线从同一点进入平行板间的匀强电场后,a粒子打在B板的a′点,b粒子打在B板的b′点,不计重力,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250034335532834.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250034335532834.jpg)
A.a的电荷量一定大于b的电荷量 |
B.b的质量一定大于a的质量 |
C.a的比荷一定大于b的比荷 |
D.b的比荷一定大于a的比荷 |
C
试题分析:据题意,带电粒子在匀强电场中做类平抛运动,其水平位移为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003433569418.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250034335841045.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003433600948.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003433787454.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003433803451.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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