带电粒子在电磁场中的运动问题一直是中学物理教学中的重要内容之一.近年来的许多热点问题开始涉及当电场与磁场在时空分布中出现间隙,而要处理的带电粒子的运动行为往往是穿过这种间隙的复杂运动.这种运动从运动特征 The movement of charged particles in the electromagnetic field has always been one of the important contents in the physics teaching of middle school.Many hot issues in recent years have begun to involve the gap in the space-time distribution between the electric field and the magnetic field, and the moving behavior of charged particles to be dealt with is often Complex movement through this gap. This movement is characterized by movement