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带电粒子在匀强磁场中运动:带电粒子垂直射入匀强磁场中,若只受洛伦兹力作用,则该粒子做匀速圆周运动,所受洛伦兹力提供向心力。由牛顿第二定律得:qvB=m(v~2)/R,所以R=(mv)/(qB),T=(2πR)/v=(2πm)/(qB).尤其是侧重于应用数学工具解决物理问题方面的考查,如考查磁场对通电导体的安培力,或考查通电导体在安培力作用下的运动,而考查带电粒子在磁场或复合场中的运动问题是高考的热点,且难度较大。
The charged particles move in a uniform magnetic field: the charged particles are vertically injected into a uniform magnetic field. If only the Lorentz force is applied, the particles move at a constant speed. The Lorentz force provides centripetal force. According to Newton’s second law: qvB=m(v~2)/R, so R=(mv)/(qB), T=(2πR)/v=(2πm)/(qB). Especially focusing on the application Mathematical tools to solve physical problems such as examining the magnetic field on the energized conductor’s amperage, or examining the energized conductor’s motion under Ampere’s force, and examining the motion of charged particles in a magnetic field or complex field is a hot spot for the college entrance examination, and Difficult.