带电粒子在磁场中运动的多解性问题解析

卢文福

摘 要：帶电粒子只在洛伦兹力作用下做匀速圆周运动，但往往会因带电粒子的电性不确定、磁场的方向不确定、初速度大小不确定、初速度方向不确定、运动的周期性等原因形成多解问题，因而教师必须指导学生通过分类讨论的方式，在综合判断的基础上优化解题路径，从而实现高中物理学习的减负增效。

关键词：高中物理;磁场;带电粒子;洛伦兹力;匀速圆周运动

中图分类号：G633.7 文献标志码：A 文章编号：1008-3561（2020）22-0116-02

Analysis of Multiple Solutions of Charged

Particle Motion in Magnetic Field

Lu Wenfu

（No.1 Middle School of Changting County， Fujian Province， Changting 366300， China）

Abstract： Charged particles only do uniform circular motion under the action of Lorentz force， but they often form multiple solution problems due to the uncertainty of the electric properties of charged particles， the direction of magnetic field， the size of initial velocity， the direction of initial velocity， and the periodicity of motion. Therefore， teachers must guide students to optimize the solution path on the basis of comprehensive judgment by means of classified discussion Path， so as to achieve high school physics learning burden reduction and efficiency.

Key words： high school physics; magnetic field; charged particles; Lorentz force; uniform circular motion