1999年高考物理试题第24题,是以带电粒子在匀强磁场中做匀速圆周运动为题型的力学和电学的综合题。此题的参考答案出现一个重要的疏漏,现先将题 The 24th question of the 1999 physical examination quizzes for college entrance examinations was based on the combination of mechanical and electrical problems in which the charged particles were made into a uniform circular motion in a uniform magnetic field. There is an important omission in the reference answer to this question.