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带电粒子垂直射入匀强磁场后作圆周运动是磁场一章中的重点内容。一般学生在写出圆周运动公式后寻求辅助方程常常遇到很大困难。困难的主要原因在于示意图不准确,造成对运动方向、运动轨迹及时间的判断不准确。本文试从圆轨迹的特点出发,分析入射速度与出射速度(或所求点速度)的方向的对称性,并总结出运
The circular motion of a charged particle perpendicular to a uniform magnetic field is an important part of the magnetic field. It is often difficult for the average student to seek an auxiliary equation after writing a circular motion formula. The main reason for the difficulty lies in the fact that the schematic diagram is inaccurate, resulting in inaccurate judgment of the direction of movement, trajectory, and time. In this paper, starting from the characteristics of the circular trajectory, the symmetry of the direction of the incident velocity and the exit velocity (or the desired velocity) is analyzed, and the outcome is concluded.