题目内容
如图甲所示,有一个等腰直角三角形的匀强磁场区域,其直角边长为L,磁场方向垂直纸面向外,磁感应强度大小为B. 一边长为L、总电阻为R的正方形导线框abcd,从图示位置开始沿x轴正方向以速度v匀速穿过磁场区域.取沿a→b→c→d的感应电流为正,则图乙中表示线框中电流
随bc边的位置坐标x变化的图象正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022370287809.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500223704413529.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002236997251.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022370287809.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500223704413529.jpg)
C
试题分析:bc边的位置坐标x在L-2L过程,线框bc边有效切线长度为l=x-L,感应电动势为E=Blv=B(x-L)v,感应电流
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002237060926.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022370751009.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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