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题目:如图1有一质量为m带负电荷且电量为q的塑料小球,从小孔S处由静止开始下落进入范围足够大的匀强磁场中,磁感应强度为B。当小球在磁场中运动列A点时(A点在图中未画出),开始沿水平方向做匀速直
Topic: As shown in Fig. 1, a plastic pellet with a mass of m and a negative charge and with an electric charge of q flows from stationary at the small hole S into a uniform magnetic field of a sufficiently large range and the magnetic induction intensity is B. When the ball moves column A in the magnetic field (A point is not shown in the figure), it starts to make a straight line in the horizontal direction.