在“磁场”一章的教学过程中,同学经常碰到这样一个问题:将质量为m、带电量为q的粒子,从匀强磁场中某点自由释放,重力的作用不能忽略,在讨论粒子进入磁场的最大深度和最大速度时,同学往往将其运动轨迹画成如图1所示形状,认为最后粒子做匀速运动,其 In the teaching process of the chapter “Magnetic Field”, classmates often encountered such a problem: The particles of mass m and charge quantity q were released from a certain point in a uniform magnetic field and the effect of gravity could not be ignored. When entering the maximum depth and maximum speed of the magnetic field, the classmates often draw their movement trajectory into the shape shown in Figure 1, and think that the last particle is moving at a uniform speed.