“垂直射入匀强磁场中的带电粒子,粒子的运动轨迹是‘圆形’”,实际教学中,学生只是“接受”结论而未“理解”结论。笔者教学中在两个平行班改变教学方法,取得了较好的效果。 “The charged particles in a uniform magnetic field are perpendicularly injected and the trajectory of the particles is ’circular’. In actual teaching, the students only “accept” the conclusion and do not “understand” the conclusion. The author changed teaching methods in two parallel classes and achieved good results.