题目内容
(1)电子做匀速圆周运动的周期T的大小;
(2)此匀强磁场的磁感应强度B的大小;
(3)若电子做匀速圆周运动的半径为R,则电子的运动速率为多大?
(1)k/f(2)
(3)2πRf/k
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115613468458.gif)
(1)T="k/f " …………………………………………(4分)
(2)设匀强磁场的磁感应强度为B,电子做匀速圆周运动的速度为v,半径为R,则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241156134996328.jpg)
(若利用
,且
,得B=
,同样给分)
(3)因为电子做匀速圆周运动的速率为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241156136713023.jpg)
(2)设匀强磁场的磁感应强度为B,电子做匀速圆周运动的速度为v,半径为R,则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241156134996328.jpg)
(若利用
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115613515483.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115613530274.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115613468458.gif)
(3)因为电子做匀速圆周运动的速率为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241156136713023.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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