题目内容
(14分)如图所示,匀强磁场的磁感应强度
,边长L=10cm的正方形线圈
共100匝,此线圈电阻
,线圈绕垂直于磁感线的对称轴
匀速转动,角速度为
,外电路电阻
,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241435194373468.jpg)
(1)转动过程中感应电动势的最大值。
(2)交流电压表的示数。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143519047498.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143519094506.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143519156438.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143519218364.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143519296784.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143519343485.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241435194373468.jpg)
(1)转动过程中感应电动势的最大值。
(2)交流电压表的示数。
(1)
(2)0.8V
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143519452443.png)
(1)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241435200141483.png)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241435201081893.png)
本题考查交变电流的产生和有效值的计算,由峰值Em=NBSw可求得峰值,根据峰值和有效值相差1.414倍可求得有效值,根据串联分压可知外电阻两端电压
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241435200141483.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241435201081893.png)
本题考查交变电流的产生和有效值的计算,由峰值Em=NBSw可求得峰值,根据峰值和有效值相差1.414倍可求得有效值,根据串联分压可知外电阻两端电压
![](http://thumb2018.1010pic.com/images/loading.gif)
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