题目内容
某匀强磁场垂直穿过一个线圈平面,磁感应强度B随时间t变化的规律如图12-2-29所示.若在某1 s内穿过线圈中磁通量的变化量为零,则该1 s开始的时刻是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241210019702620.jpg)
图12-2-29
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241210019702620.jpg)
图12-2-29
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121001986261.gif)
在0~2 s内,B=0.2+0.4t1(T)
在2~4 s内,B=1-0.3(t2-2)(T)
又t2-t1="1" s,联立解得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121002032325.gif)
在2~4 s内,B=1-0.3(t2-2)(T)
又t2-t1="1" s,联立解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121002032325.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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