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质量为m、边长为L的正方形线框,从有水平边界的匀强磁场上方由静止自由下落,线框电阻为R,匀强磁场的宽度为H(H>L),磁感强度为B,方向水平.线框下落过程中ab边与磁场界面平行、与磁场垂直.已知ab边刚进入磁场和刚穿出磁场时都作减速运动,加速度大小均为a=g/4(g为当地的).不计空气阻力,试求:(1)ab边刚进入磁场时速度v1的大小;(2)cd边刚进入磁场时线框速度v2的大小;(3)线框穿越整个磁场的过程中消耗的电能.
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