题目内容
矩形导线框abcd放在匀强磁场中,磁感线方向与线圈平面垂直。磁感强度B随时间变化的图象如图所示.T=0时刻.磁感强度的方向垂直于纸面向里.在0~4s叫间内.线框的ab边受力随时间变化的图象(力的方向规定以向左为正方向)可能如图中
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500280423922509.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500280425531268.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500280423922509.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500280425531268.png)
D
试题分析:T=0时刻.磁感强度的方向垂直于纸面向里,结合图像T=0时刻磁场为负,说明磁场以向外为正方向。0—1s,磁场向里,大小在减小,根据楞次定律增反减同,感应电流的磁场方向向里,右手判断感应电流方向顺时针,即从a到b。感应电流大小
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002804270903.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002804286391.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002804301450.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002804317494.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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