磁偏转问题即带电粒子在磁场中做匀速圆周运动的问题,一直是高考考查的热点,特别是近几年,每年都出了一道有关这方面的题目.解决这类问题的关键是:确定带电粒子圆轨道的圆心.下面以全国高考题为例说明确定粒子轨道圆心的方法. The problem of magnetic deflection, that is, the problem of uniform circular motion of charged particles in a magnetic field, has always been a hot spot for the examination of the college entrance examination. Especially in recent years, there has been a topic in this respect every year. The key to solving this kind of problem is to determine the liveness. The circular center of the particle’s circular orbit. The following uses the national college entrance examination question as an example to illustrate the method of determining the center of orbit of the particle.