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七、静电场【知识总结】一、本专题重点知识1.电场中电势、电势能高低的判定(1)根据场源电荷判断(取无穷远为零势点).(2)根据电场线判断电势,根据电场力做功判断电势能.2.静电力做功及电势差、电势能的计算静电力做功与路径无关,只与初末位置有关.计算方法:(1)用功的定义式W=FScosθ来计算(F为恒力,仅适用于匀强电场中).(2)用“静电力做的功等于电势能的减少量”来计算,即WAB=EpA-EpB=q(φA-φB)=qUAB,适用于任何电场.但WAB、UAB均有正负,
Seven, the electrostatic field 【Summary of knowledge】 First, the focus of this topic knowledge 1. Electric field potential, potential energy level of the judge (1) According to the field of charge to determine (take the infinity as a zero point.) (2) According to the electric field line Potential, according to the electric field power work to determine the potential energy .2 static power work and potential difference, potential energy calculation static power work has nothing to do with the path, only with the initial position of the relevant.Calculation methods: (1) the work of the definition of W = FScosθ (F is a constant force, only applies to a uniform electric field). (2) Calculated by “the work done by the electrostatic force equal to the reduction of the potential energy”, that is, WAB = EpA- EpB = q ) = qUAB, apply to any electric field.But WAB, UAB have positive and negative,