题目内容
如图所示,铅盒A中装有天然放射性物质,放射线从其右端小孔中水平向右射出,在小孔和荧光屏之间有垂直于纸面向里的匀强磁场,(不计射线粒子的重力),则下列说法中正确的有( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241347224951596.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241347224951596.png)
A.打在图中a、b、c三点的依次是![]() ![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.如果在铅盒和荧光屏间再加一竖直向上的匀强电场,则屏上的亮斑可能只剩下b |
B
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134722807310.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134722605339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134722651304.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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