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带电粒子在匀强磁场中做圆周运动的问题是近几年高考的热点,这些考题不但涉及洛伦兹力作用下的动力学问题,而且往往与平面图形的几何关系相联系,对答题者综合分析问题以及运用数学知识解题的能力要求较高.但无论这类问题情境多么新颖、设问多么巧妙,其关键点在于规范、准确地画出带电粒子的运动轨迹.只要确定了带电粒子的运动轨迹,问题便迎刃而解.下面归纳几种确定带电粒子运动轨迹的方法.
The problem that the charged particles make circular motion in a uniform magnetic field is a hot spot in college entrance examination in recent years. These test questions not only involve the kinetic problems under Lorentz force, but also relate to the geometric relation of plane graph, Analysis of the problem and the ability to use mathematical knowledge to solve the problem is higher.However, no matter how novel the situation of such questions, ask how clever, the key point is to regulate and accurately draw the trajectory of charged particles.Once the charged particles Motion trajectory, the problem will be solved.Following several ways to determine the trajectory of charged particles.