题目内容
如图所示,带正电的粒子以一定的初速度v0沿中线进入水平放置的平行金属板内,恰好沿下板的边缘飞出,已知板长为L,板间的电压为U,带电粒子的带电量为+q,粒子通过平行金属板的时间为T,不计粒子的重力,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002422536619.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002422536619.jpg)
A.粒子在前![]() ![]() |
B.粒子在后![]() ![]() |
C.粒子在竖直方向下落前![]() ![]() |
D.粒子在竖直方向下落前![]() ![]() |
B
试题分析:带电粒子在电场中做类平抛运动,竖直方向上做匀加速直线运动,根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000242425731.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000242441444.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000242472935.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002424871076.png)
后
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000242441444.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000242503771.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002425341106.png)
粒子在竖直方向下落前
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000242363411.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000242363411.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002425971051.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000242612548.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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