题目内容
A如图所示,面积为0.2 m2的100匝线圈处在匀强磁场中,磁场方问垂直于线圈平面,已知磁感应强度随时间变化的规律为B=(2+0.2t)T,定值电阻R1=6Ω,线圈电阻R2=4Ω,求 a、b两点间电压Uab ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408209343349.jpg)
A.2.4V | B.0.024V | C.4V | D.1.6V |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408209343349.jpg)
A
】回路中磁通量的变化率
=S
="0.2×0.2" Wb/s="0.04" Wb/s.回路中的感应电动势
E=n
="100×0.04" V="4" V.等效电路如图所示,其中r=R2,根据闭合电路欧姆定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408213081322.jpg)
I=
A="0.4" A.ab两点间的电势差为IR1=2.4V,A对;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140820950453.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140821215457.png)
E=n
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140820950453.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241408213081322.jpg)
I=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140821355893.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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