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解决带电粒子在有界匀强磁场中的圆周运动,可以先将磁场视为无界磁场,让粒子能够做完整的圆周运动,作好粒子运动轨迹的示意图,并充分利用圆的有关特性、圆的对称性等几何知识,如弦切角等于圆心角的一半、速度的偏转角等于圆心角、粒子在磁场中的运动时间与圆心角成正比等.粒子在有界匀强磁场中的运动涉及力学中的临界问题较多,解决此类问题的关键是找准临界点,即以题目中的“恰好”“最大”
Solve the circular motion of the charged particles in the bounded uniform magnetic field, the magnetic field can be regarded as the unbounded magnetic field first, so that the particles can do the complete circular motion and make the schematic diagram of the trajectory of the particle, and make full use of the related characteristics of the circle, Symmetry and other geometric knowledge, such as chipping angle equal to half of the central angle, the speed of the deflection angle is equal to the central angle, the particles in the magnetic field movement time is proportional to the central angle, etc. Particle in a uniform uniform magnetic field motion involving mechanics The critical problem in the solution to these problems is to find the critical point, that is, in the title “just ” “maximum ”