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带电粒子垂直进入匀强磁场,若受到一定阻力作用,其速度大小和方向均不断变化,所受洛伦兹力的大小和方向也会随之发生变化,无疑会给带电粒子运动过程的分析带来困难.而带电粒子运动过程中速度变化的连续性更能体现物理过程的实质,对于这一类型问题的分析和讨论更能锻炼和提高学生的思维能力,常见于物理竞赛试题中,所涉及的一些解法更值得我们去探索、思考、理解和应用.
The charged particles enter the uniform magnetic field vertically. If the particles are subjected to a certain resistance, the magnitude and direction of the Lorentz force will change, and the magnitude and direction of the Lorentz force will also change. It will undoubtedly give analysis of the charged particle motion process. Difficult to come. The continuity of speed changes in the process of charged particles can better reflect the essence of the physical process. Analysis and discussion of this type of problem can better exercise and improve students’ thinking ability, which is common in the physical contest test questions. Some of the solutions are more worth our exploration, thinking, understanding and application.