如图所示,相距为d的两条水平虚线L1、L2之间是方向垂直纸面向里的

如图所示,相距为d的两条水平虚线L1L2之间是方向垂直纸面向里的匀强磁场,磁感应强度为B,正方形线圈abcd边长为LLd),质量为m,电阻为R,将线圈在磁场上方高h处静止释放,cd边刚进入磁场时速度为v0cd边刚离开磁场时速度也为v0,则从线圈cd边刚进入磁场起一直到ab边离开磁场的过程中正确的是(      )

(A)感应电流所做的功为mgd

(B)感应电流所做的功为2mgd

(C)线圈的最小速度可能为

(D)线圈的最小速度一定为

 

答案

BCD

解析:

 

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