题目内容
如图所示,有界匀强磁场区域的半径为r,磁场方向与导线环所在平面垂直,导线环半径也为r, 沿两圆的圆心连线方向从左侧开始匀速穿过磁场区域,在此过程中.关于导线环中的感应电流i随时间t的变化关系,下列图象中(以逆时针方向的电流为正)最符合实际的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032247597897.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032247597897.jpg)
A
试题分析:线圈进磁场过程切割磁感线的有效长度是在磁场中的首位连接的线段,如下图所示,有效长度即两个圆环的公共弦长,设圆环半径为R,则弦长
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224791731.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032248061294.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224822297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224822297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003224869373.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032248843526.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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