带电粒子在匀强磁场中的运动问题,是高考的热点和重点,当然也是学生学习中的难点.解决这类问题,先画好草图,确定带电粒子在磁场中的运动轨迹,然后利用几何关系,运动规律求解.质量为m、电荷量为q的粒子以速度v垂直射入磁场中,在匀强磁场B中做匀速圆周运动,其轨道半径是R=mvqB.由 Charged particles in uniform magnetic field movement problem is the hot spot and focus of the college entrance examination, of course, students learning difficulties.To solve these problems, first draw a good sketch to determine the trajectory of charged particles in the magnetic field, and then use the geometric relationship , The movement law solves.The mass m, the electric charge quantity q particles perpendicularly into the magnetic field velocity v, in the uniform magnetic field B does the constant circular motion, its track radius is R = mvqB