题目内容
如图所示,线圈匝数n=100匝,面积S=50cm2,线圈总电阻r=10Ω,外电路总电阻R=40Ω,沿轴向匀强磁场的磁感应强度由B=0.4T在0.1s内均匀减小为零再反向增为B=0.1T,求(1)磁通量的变化率为多少?(2)感应电流大小为多少?(3)线圈的输出功率为多少?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241159423843264.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241159423843264.jpg)
(1)2.5×10-2Wb/s(2)5×10-2A(3)0.1W
(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115942399307.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115942415576.gif)
(3)P=I2·R=(5×10-2)2×40=0.1W------------------------(3分)
![](http://thumb2018.1010pic.com/images/loading.gif)
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