题目内容
一个矩形线圈在匀强磁场中转动产生的交流电动势为
.关于这个交变电流,下列说法中正确的是( ).
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133107728845.png)
A.交变电流的频率为100Hz | B.电动势的有效值为220V |
C.电动势的峰值约为311V | D.t=0时,线圈平面与中性面垂直 |
BC
由交变电流瞬时值
,电动势最大值为220
V,有效值为
V,角速度w=100π,频率
,A错B对,t=0时电动势瞬时值为0V,所以此时线圈在中性面
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133107774680.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133107821336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133107899706.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133107962889.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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