题目内容
如图所示,闭合的矩形导体线圈abcd在匀强磁场中绕垂直于磁感线的对称轴OO′匀速转动,沿着OO′方向观察,线圈沿逆时针方向转动。已知匀强磁场的磁感强度为B,线圈匝数为n,ab边的边长为l1,ad边的边长为l2,线圈总电阻为R,转动的角速度为
,则当线圈转至图示位置时
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041120722257.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004112056268.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041120722257.png)
A.线圈中感应电流的方向为abcda |
B.线圈中的感应电动势为![]() |
C.穿过线圈磁通量随时间的变化率最大 |
D.线圈ad边所受安培力的大小为![]() |
C
试题分析:线框绕垂直磁场的转轴匀速转动,产生正弦交流电,感应电动势最大为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004112118899.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004112134457.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004112150400.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004112165931.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041121811084.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041121961269.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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