论文部分内容阅读
电场强度是电场一章一个非常重要的物理量，它 是用来描述电场力性质的物理量。关于电场强度的 求解公式，高中阶段主要有三个：(1)定义式 E=F/q， 适用于任何电场；(2)真空中的点电荷场强求解公式： E=KQ/r~2，仅适用于真空中点电荷 Q 所激发的电场； (3)推导式：E=U/d，仅适用于匀强电场，其中 d 是某 两点沿电场方向的距离。从现在的考试上看，往往将 以上这些公式及矢量常用的平行四边形定则等知识 综合在一起进行考查，下面就几道典型例题进行归类 分析以供大家参考。
The electric field strength is a very important physical quantity in the electric field chapter. It is a physical quantity used to describe the nature of the electric field force. There are three main formulas for solving the electric field strength in high school: (1) The definition formula E=F/q applies to any electric field; (2) The point charge field strength formula in vacuum: E=KQ/r~2, Only applicable to the electric field excited by point charge Q in vacuum; (3) Derivation: E=U/d, only applicable to uniform electric field, where d is the distance of some two points along the electric field direction. From the current examination, we often combine the knowledge of the above formulas and the commonly used parallelogram rule of the vector to examine them. Here are some typical examples for classification and analysis for your reference.