题目内容
一个面积为S的单匝矩形线圈,在匀强磁场中以一条边为转轴做匀速转动,磁场方向与转轴垂直.线圈中感应电动势e与时间t的关系如图所示,感应电动势的最大值和周期可由图中读出,则磁场的磁感应强度为________,在时刻t=
时,线圈平面与磁感应强度的夹角等于________.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213224439677.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213222832434.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213224439677.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213225656733.png)
试题分析:从题图中可以读出感应电动势的最大值Em和周期T,已知线圈的面积为S.
转动轴只要与磁场方向垂直,感应电动势为最大值时,线圈面与磁场方向平行,感应电动势的最大值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213226857641.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213227559619.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242132287451007.png)
e=Emsin (ωt+
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213230133421.png)
当t=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824213222832434.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242132319581095.png)
点评:学会通过瞬时感应电动势来判定在什么时刻,线圈处于什么位置;同时还能画出磁通量随着时间变化的图象及线圈中的电流随着时间变化的规律.
![](http://thumb2018.1010pic.com/images/loading.gif)
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