题目内容
边长为L的正方形线框在匀强磁场B中以
角速度匀速转动,产生的感应电流的最大值为Im,设灯泡的电阻为R,其它电阻不计。从如图位置开始计时,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250044481163799.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004448101308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250044481163799.png)
A.Im= BL2 ![]() | B.电路中交流电的表达式为Imsin![]() |
C.电流表的读数为Im/2 | D.电阻R上产生的电功率为![]() |
AD
试题分析: 感应电动势的最大值Em=BLv=BL
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004448101308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004448101308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004448101308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004448101308.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004448272515.png)
P=I2R=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004448288733.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004448179602.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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