在学习知识点“带电粒子在磁场中运动”时,有这样一道典型的磁场问题,学生存在很多错误的认识.现把这些共性错误总结如下,以期对同学们的学习有所帮助和启示.题目:如图1所示,在半径为r的圆形区域内,有方向垂直于纸面向里的匀强磁场,一个带负电的粒子从A点沿半径方向以速度v射入 When learning the knowledge that “charged particles move in a magnetic field”, there is such a typical magnetic field problem that students have a lot of misunderstandings. These common mistakes are summarized as follows in order to help students learn and inspire. As shown in Fig. 1, in a circular area with a radius r, there is a uniform magnetic field oriented perpendicular to the paper inward. A negatively charged particle is injected from point A radially at a velocity v.