070带电粒子在交变电场中的运动 精讲精练-2022届高三物理一轮复习疑难突破微专题
070带电粒子在交变电场中的运动 一.必备知识1.常见的交变电场常见的产生交变电场的电压波形有方形波、锯齿波、正弦波等.2.常见的题目类型(1)粒子做单向直线运动(一般用牛顿运动定律求解).(2)粒子做往返运动(一般分段研究).(3)粒子做偏转运动(一般根据交变电场特点分段研究).3.思维方法(1)注重全面分析(分析受力特点和运动规律):抓住粒子的运动具有周期性和在空间上具有对称性的特征,求解粒子运动过程中的速度、位移、做功或确定与物理过程相关的临界条件.(2)从两条思路出发:一是力和运动的关系,根据牛顿第二定律及运动学规律分析;二是功能关系.(3)注意对称性和周期性变化关系的应用.4.利用速...
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