电场这一章,概念多,综合强,抽象又难懂,在解题过程中,通过一个知识点或一道例题进行多种形式的拓展,然后进行具体的分析,改变或附加一些物理条件,使原题变成一系列的具有不同侧重点的相似系列题,从而拓宽视野,开拓思维. In the chapter of electric field, there are many concepts, comprehensiveness, abstraction and comprehension. Through the process of problem solving, through a knowledge point or an example, various forms of expansion are carried out, and then specific analysis is carried out to change or add some physical conditions so that The original title turns into a series of similar series of questions with different focuses, so as to broaden their horizons and broaden their thinking.