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带电粒子在磁场中运动的极值问题是学生普遍认为的学习难点 .中学阶段 ,考虑到带电粒子以速度 v垂直于磁场方向进入有界均匀磁场 ,在只受洛伦兹力作用时 ,粒子做匀速圆周运动这一特点 ,而极值问题又涉及到粒子初速度大小、方向 ,以及磁场形状、边界等条件的约束 .能否从分析带?
The extreme value of moving charged particles in a magnetic field is a common learning difficulty for students. In secondary school, when charged particles enter the bounded uniform magnetic field perpendicular to the direction of the magnetic field with the velocity v, the particles do only when they are subjected to the Lorentz force. The characteristics of uniform circular motion, and the issue of extreme value involves the initial velocity of the particle, the direction, and the constraints of the magnetic field shape, boundary conditions, etc. Can it be analyzed from the band?