题目内容
如图所示,带有正电荷的A粒子和B粒子先后以同样大小的速度从宽度为d的有界匀强磁场的边界上的O点分别以30°和60°(与边界的夹角)射入磁场,又都恰好不从另一边界飞出,则下列说法中正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039432762168.jpg)
A.A、B两粒子在磁场中做圆周运动的半径之比是![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943292394.png)
B.A、B两粒子在磁场中做圆周运动的半径之比是![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943307526.png)
C.A、B两粒子
之比是![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943292394.png)
D.A、B两粒子
之比是![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943307526.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039432762168.jpg)
A.A、B两粒子在磁场中做圆周运动的半径之比是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943292394.png)
B.A、B两粒子在磁场中做圆周运动的半径之比是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943307526.png)
C.A、B两粒子
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943323454.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943292394.png)
D.A、B两粒子
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943323454.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943307526.png)
BD
试题分析:由题意知,粒子在磁场中由洛伦兹力提供向心力,根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943370761.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943385672.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943401704.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943385672.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943323454.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003943307526.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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