题目内容
如图17-2-7所示,闭合矩形线圈abcd在匀强磁场中绕OO′匀速转动,在图示位置时,线圈受到的磁力矩为M1,若从图示的位置转过θ角(θ<90°)时,线圈受到的磁力矩为M2,则M1∶M2( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206443332913.jpg)
图17-2-7
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206443332913.jpg)
图17-2-7
A.1∶cos2θ | B.1∶Sin2θ ? | C.1∶cosθ | D.1∶Sinθ |
A
线圈在磁场中旋转受到的磁力矩M=M0cosθ(式中θ为线圈平面与磁感线夹角),M0=BIS,
,整理后得
,故当θ1=0和θ2=θ时,线圈受到的磁力矩M1∶M2=1∶cos2θ,故选A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120644349609.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120644364687.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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