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带电粒子在有界磁场中的问题,在考查学生知识的同时,突出考查了学生各方面能力,是高考的热点也是平时教学中的难点。在解决此类问题时,应用包络圆解题是一个行之有效的方法,但是在应用过程中,存在一个隐蔽的错误,本文旨在探索包络圆方法在应用中的这个误区。模型特征:带电粒子从某一点以大小不变而方向不限定的速度垂直磁场方向射入面积足够大的匀强磁场中,把其轨迹连续起来观察可认为是一个半径不变的圆,这个圆与每个轨迹
The problem of charged particles in a bounded magnetic field, while examining students ’knowledge, highlights the students’ abilities in all aspects and is a hot spot in the college entrance examination as well as a difficult point in normal teaching. In solving such problems, the application of envelope circle problem solving is an effective method, but there is a hidden error in the application process, this paper aims to explore the enveloping circle method in the application of this error. Model features: charged particles from a point to the same size and direction of the speed of the vertical direction of the magnetic field into a sufficiently large uniform magnetic field, the trajectory of continuous observation can be considered as a constant radius of the circle, the circle With each track