带电粒子在复合场中的运动是高考考查的热点问题之一,尤其是以速度选择器、回旋加速器、磁流体发电机、霍尔效应以及磁流体泵等为背景的联系现代科技的问题,能很好考查学生用所学的物理知识解决新问题的综合能力,更受命题者的青睐,需引起高度重视,下面分析它们的原理及应用。 The movement of charged particles in the composite field is one of the hottest topics in the entrance examination, especially the problems related to modern technology, such as speed selector, cyclotron, magnetic fluid generator, Hall effect, and magnetic fluid pump. The comprehensive ability of the students to use the physics knowledge they learned to solve new problems is well received by the propositioners, and they need to be highly valued. The following analyses their principles and applications.