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电场强度是描述电场力学性质的物理量,历届高考对场强的考查时有涉及.本文以近三年各地的高考选择题为例,介绍场强的种种求解方法,希望对读者有所启发.一、公式法例1(2012·江苏·1)真空中,A、B两点与点电荷Q的距离分别为r和3r,则A、B两点的电场强度大小之比为()A.3:1 B.1:3C.9:1 D.1:9
The strength of electric field is a physical quantity that describes the mechanical properties of electric field, and the examination of field strength has been involved in the past college entrance examinations.This article takes the multiple choice questions of colleges and universities in recent three years as an example to introduce various solutions of field strength, hoping to inspire the readers.One, Formula 1 (2012 · Jiangsu 1) vacuum, A, B two points and point charge Q distance r and 3r, then A, B two points of the electric field intensity ratio of size () A.3: 1 B.1: 3C.9: 1 D.1: 9