题目内容
如右图所示,带有正电荷的A粒子和B粒子同时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°(与边界的交角)射入磁场,又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/20140824/201408241301187321585.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/20140824/20140824130118763334.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/20140824/20140824130118810447.png)
C.A、B两粒子的
之比是![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130118763334.png)
D.A、B两粒子的
之比是![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130118810447.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301187321585.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/20140824/20140824130118763334.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/20140824/20140824130118810447.png)
C.A、B两粒子的
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130118841375.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130118763334.png)
D.A、B两粒子的
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130118841375.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130118810447.png)
BD
RAcos30°+RA=d,RBcos60°+RB=d,,解得
,A错B对;因
,故
,故
,C错D对
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301189511027.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130118982572.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130118997654.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130119044855.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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