061电场线与等势线(面)的应用 精讲精练-2022届高三物理一轮复习疑难突破微专题
061电场线与等势线(面)的应用 一.必备知识(一)电场线 1.定义:为了形象地了解和描述电场中各点电场强度的大小和方向,而画在电场中的一条条有方向的曲线。电场线是假想的曲线,实际不存在。2.电场线的特点(1)电场线上每点的切线方向表示该点的电场强度方向。(2)电场线从正电荷或无限远出发,终止于无限远或负电荷。(3)电场线在电场中不相交、不闭合、不中断。(4)在同一幅图中,电场强度较大的地方电场线较密,电场强度小的地方电场线较疏。(5)沿电场线的方向电势逐渐降低。(6)电场线和等势面在相交处垂直。3.几种典型电场的电场线如图所示是几种典型电场的电场线分布图。4.电场线的应用5.两种特殊的电场线...
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