题目内容
如图,处在磁感应强度为B的匀强磁场中的单匝矩线圈abcd,以恒定的角速度
绕ab边转动,磁场方向垂直于纸面向里,线圈所围面积为S,线圈导线的总电阻为R,t=0时刻线圈平面与纸面重合,且cd边正在离开纸面向外运动。则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241958191012978.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195818508205.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241958191012978.jpg)
A.时刻t线圈中电流的瞬时值![]() |
B.线圈中电流的有效值![]() |
C.线圈中电流的有效值![]() |
D.线圈消耗的电功率![]() |
C
试题分析:时刻t线圈中电流的瞬时值
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195822128893.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195823220760.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241958242811014.png)
故选C
点评:正确写出交流电表达式是解决本题的关键,题目难度不大.
![](http://thumb2018.1010pic.com/images/loading.gif)
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