带电粒子在磁场中的偏转是历年高考的必考内容和压轴题目。这类问题主要考查综合分析能力和应用数学工具处理物理问题的能力。笔者多年的教学实践发现,影响解决问题的主要因素其实不在物理,而在数学。简单的讲,就物理而言,无非是几个千题一面的公式:qvB=m(v~2)/rT=(2πr)/vs=vtt=φ/(2π)T真正的难点是在几何上出了问题,也就是说,学生不善于找或找不到几何关系。所谓几何关系无非是角与角、角与边和边与边的关系。由于这些几何关系百题百样,所以就成 The deflection of charged particles in the magnetic field over the years is the compulsory examination content and the subject of the Finale. These types of questions examine the ability to synthesize analytical skills and apply mathematical tools to deal with physical problems. The author’s years of teaching practice found that the main factors that affect the solution to the problem are actually not in physics, but in mathematics. Simply put, in terms of physics, there are just a few formulas that go into question: qvB = m (v 2) / rT = (2πr) / vs = vtt = φ / (2π) The real difficulty is that in geometry There is a problem, that is, students are not good at finding or finding a relationship. The so-called geometric relationship is nothing more than angle and angle, angle and edge and edge and edge relationship. As a result of these geometric problems, so into