题目内容
如图,一束带电粒子以一定的初速度沿直线通过由相互正交的匀强磁场(B)和匀强电场(E)组成的速度选择器,然后粒子通过平板S上的狭缝P,进入另一匀强磁场B′,最终打在A1A2上.下列表述正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250045063224228.jpg)
A.粒子带负电
B.所有打在A1A2上的粒子,在磁场B′中运动时间都相同
C.能通过狭缝P的带电粒子的速率等于![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004506337239.png)
D.粒子打在A1A2上的位置越靠近P,粒子的比荷
越大
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250045063224228.jpg)
A.粒子带负电
B.所有打在A1A2上的粒子,在磁场B′中运动时间都相同
C.能通过狭缝P的带电粒子的速率等于
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004506337239.png)
D.粒子打在A1A2上的位置越靠近P,粒子的比荷
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004506353251.png)
CD
在磁场B′中由左手定则可知,粒子带正电,选项A错误;所有在A1A2上的粒子,在磁场B′中的运动时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004506368457.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004506384251.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004506400335.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004506415284.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004506431365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004506353251.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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