“带电粒子在磁场中的运动”是历年高考中的一个重要考点,而这一考点的试题多以带电粒子在有界磁场子中的运动为情景,许多考生对这类问题的过渡解感到困惑,其原因是带电粒子进入设定的有界磁场后只运动一段圆弧就飞出磁场边界,其轨迹不是完整的圆,它要求考生根据带电粒子运动的几 The “movement of charged particles in a magnetic field” is an important test point in the college entrance examinations over the years. The test questions on this test center are mostly charged particle motions in bounded magnetic fields. Many candidates have a solution to these problems. Confused, the reason is that charged particles enter a set bounded magnetic field and only move a certain arc to fly out of the magnetic field boundary. Its trajectory is not a complete circle. It requires the candidate to move according to the charged particles.