题目内容
如图所示,在磁感强度为B的匀强磁场中,有半径为
的光滑半圆形导体框架,OC为一能绕O在框架上转动的导体棒,Oa之间连一个电阻
,导体框架与导体棒的电阻均不计,若使OC能以角速度
匀速转动,则 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241433572403369.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143356944260.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143357084303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143357162308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241433572403369.jpg)
A.导体棒OC的O端的电势高于C端的电势 |
B.流经电阻R的电流大小为![]() |
C.导体棒受到的安倍力是![]() |
D.外力做功的功率是![]() |
AB
由于导体棒匀速转动,所以外力的功率与产生的感应电流的电功率相等.根据法拉第电磁感应定律得:
,由此可求得感应电流大小,OC切割磁感线,相当于电源,在电源内部电流由正极流向负极,所以电功率为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143357786610.png)
,AB对;CD错;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143357662890.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143357786610.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143358130731.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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