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近年高考频繁出现动态圆问题,即带电粒子进入磁场时入射速度大小或方向不断变化的问题,是带电粒子在有界磁场中运动的难点。本文以粒子入射速度大小不变,方向时刻变化类问题为例,说明动态圆的定态分析。基本模型在磁场中向垂直于磁场的各个方向发射粒子时,粒子入射速度的大小不变,由Bqv_0=
In recent years, college entrance examination frequent dynamic circle problem, that charged particles into the magnetic field when the size or direction of the incident velocity changes, is charged particles in a bounded magnetic field in the movement of the difficulty. In this paper, we take the case that the incident velocity of particle is constant and the change of direction moment is taken as an example to illustrate the steady state analysis of dynamic circle. When the basic model emits particles in all directions perpendicular to the magnetic field in the magnetic field, the incident velocity of the particle does not change, and Bqv_0 =