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带电粒子在磁场中运动问题是高考的重点、难点和热点,该内容每年必考且推陈出新,这类考题与隐含条件、临界条件、图象等密不可分,由于带电粒子运动的周期性以及磁感应强度和速度矢量的大小和方向的不确定性,往往考题难点较大,要求学生有很强的分析综合能力,能体现高考的选拔功能,有很好区分度,所以备受高考命题专家的青睐.下面举几例分析,起抛砖引玉作用.一、速度大小、方向的变化
The movement of charged particles in the magnetic field is the focus of the college entrance examination, the difficulty and hot spots, the content of the annual test and innovation, such exam questions and implied conditions, critical conditions, images, etc. are inseparable due to the cyclical movement of charged particles and magnetic induction Strength and speed of the vector size and direction of the uncertainty, often more difficult questions, requiring students to have a strong ability to analyze the comprehensive selection of the performance of the college entrance examination, there is a good degree of distinction, so much the proposition of college entrance examination proponents of all ages Here are a few examples of analysis, starting throwing bricks jade effect. A speed, size, direction changes