题目内容
如右图所示,MN右侧有一正三角形匀强磁场区域(边缘磁场忽略不计),上边界与MN垂直。现有一与磁场边界完全相同的三角形导体框,从MN左侧垂直于MN匀速向右运动。导体框穿过磁场过程中所受安培力F的大小随时间变化的图象以及感应电流i随时间变化的图象正确的是(取逆时针电流为正)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250029540324624.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250029540324624.jpg)
BC
试题分析:线框进入磁场过程,磁通量增大,根据楞次定律,感应电流沿逆时针方向为正,出磁场过程磁通量减少,感应电流为顺时针方向为负。线框匀速进入磁场设速度为v,时间为t,则切割磁感线的有效长度是磁场中线框首尾连接的线段即
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002954032331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002954048594.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002954063920.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250029540941180.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250029540941943.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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