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题目如图1所示,固定于水平面上的金属架CDEF处在竖直向下的匀强磁场中.金属棒MN沿框架以速度v向右做匀速运动.t=0时,磁感应强度为B0,此时MN到达的位置恰好使
The problem is shown in Fig. 1. The metal frame CDEF fixed on the horizontal surface is in a vertically downward uniform magnetic field. The metal rod MN moves along the frame at a uniform velocity v to the right. When t=0, the magnetic induction intensity is B0. At this point, the MN arrives at the exact location