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磁场的强弱和运动速度的大小决定了荷质比一定的粒子在磁场中做圆周运动的半径,而磁场分布的位置(或者粒子进与出磁场的位置)和磁场在空间分布的范围限定了粒子运动的轨迹,从而决定了粒子运动径迹所对应的圆心角和所夹的弦,进而决定了粒子在有界磁场中运动的时间和实际通过的路程。粒子从什么位置以什么样的速度进入和射出有界磁场,以及有界磁场的分布区域成为决定粒子进出有界磁场最值问题的重要条件。
The magnitude of the magnetic field and the velocity of the motion determine the radius of the circular motion of the particles in the magnetic field of a certain specific charge. The position of the magnetic field distribution (or the position of the particles in and out of the magnetic field) and the range of the magnetic field in the spatial distribution define Particle trajectory, and thus determine the trajectory of the particle corresponding to the central angle and the chord of the folder, and thus determine the particles in the bounded magnetic field in the movement of the time and the actual passage. From what position the particle enters and emits the bounding magnetic field at what speed, and the distribution area of the bounding magnetic field becomes the important condition that determines the maximum value of the particle entering and leaving the bounding magnetic field.