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带电粒子在只受洛伦兹力作用下,垂直进入匀强磁场,它将做匀速圆周运动.有界磁场是磁场中运动一类常见题目,而圆是中心对称图形,圆形磁场考查成了学生能否灵活和熟练应用知识解决问题的最重要的题型,但许多学生感到无从下手,容易将磁场圆和轨迹圆混淆.解决此类问题的基本思路有两种:(1)画轨迹→找圆心→求半径,同时要特别注意对称性,弄清这两个圆的几何关系.(2)在平时的教学中,注意引导学生得出一些常用的结论,节省考试时思考的时间.结论一粒子速度方向指向圆形磁场的
Under the action of Lorentz force, the charged particles enter the uniform magnetic field vertically, and it will do uniform circular motion. The bounded magnetic field is a common problem in the magnetic field and the circle is the center symmetrical figure, and the circular magnetic field test becomes a Students can use the knowledge of the most flexible and proficient problem-solving, but many students feel unable to start, easy to circle and track circle confusion.There are two basic ideas to solve such problems: (1) draw the trajectory → Find the center → find the radius, and pay special attention to the symmetry, and find out the geometric relationship between the two circles. (2) In normal teaching, pay attention to guiding students to draw some commonly used conclusions, saving time for thinking when exams. A particle velocity direction pointing circular magnetic field