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如图所示,相距为d的两水平直线L1和L2分别是水平向里的匀强磁场的边界,磁场的磁感应强度为B,正方形线框abcd边长为L(L<d )、质量为m.将线框在磁场上方ab边距L1为h处由静止开始释放,当ab边进入磁场时速度为V0,cd边刚穿出磁场时速度也为V0.从ab边刚进入磁场到cd边刚穿出磁场的整个过程中( ) A.线框一直都有感应电流 B.线框一定有减速运动的过程 C.线框不可能有匀速运动的过程 D.线框产生的总热量为mg(d+h+L)
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