题目内容
矩形金属线圈在匀强磁场中匀速转动,产生的电动势为
,则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241743186311031.png)
A.交流电的频率是100π Hz |
B.t=0时,线圈位于中性面 |
C.交流电的周期是0.02 s |
D.t=0.05 s时,e有最大值 |
BC
试题分析:根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174318865568.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241743191151070.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174319349704.png)
故选BC
点评:关键是掌握公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174319598655.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824174318865568.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.交流电的频率是100π Hz |
B.t=0时,线圈位于中性面 |
C.交流电的周期是0.02 s |
D.t=0.05 s时,e有最大值 |