题目内容
如图所示,在一半径为50cm环形绝缘光滑细管处在着垂直纸面向里的匀强磁场中,磁感应强度为2.2T,管内有一个质量为10g的带电小球以6m/s的速度从管的最低点逆时针管中运动,运动到管的最高点时恰好对管没有作用力。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241308548932677.jpg)
小题1:带电小球在最高点的速度为多大?
小题2:带电小球的电性,及带电量为多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241308548932677.jpg)
小题1:带电小球在最高点的速度为多大?
小题2:带电小球的电性,及带电量为多少?
小题1:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130854908985.png)
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241308550951410.png)
(1)
(2分)
(1分)
(2)
(2分)
(1分)
指向圆心 (2分)
(1分)
左手点则判断小球带正电 (1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130855298986.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130855376164.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130854908985.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130855501929.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130855704652.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241308557511202.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241308550951410.png)
左手点则判断小球带正电 (1分)
![](http://thumb2018.1010pic.com/images/loading.gif)
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