论文部分内容阅读
带电粒子在匀强磁场中做匀速圆周运动的问题是高中物理常见题型,是高考的热点,也是高三复习的教学难点。解决此问题用到的物理知识并不复杂,只需用到左手定则,洛伦兹力充当向心力即qvB=mv~2/r r=mv/qB和周期公式T=2πr/v T=2πm/qB。从教学实际来看,本部分的教学效果并不理想。主要原因是学生不会运用几何知识找圆心,画轨迹。
Charged particles in a uniform magnetic field to do uniform circular motion problem is a common problem in high school physics, college entrance examination is the hot spot, but also the third year of teaching review difficult. The physical knowledge used to solve this problem is not complicated, just use left-hand rule, Lorentz force acts as centripetal force namely qvB = mv ~ 2 / rr = mv / qB and periodic formula T = 2πr / v T = 2πm / qB. From the teaching point of view, this part of the teaching effect is not ideal. The main reason is that students do not use geometric knowledge to find the center of the circle and draw tracks.