为了形象化地表示电场,引入了电场线的概念,这就为解决电场中的问题提供了很多方便.而对电场线的叙述,以前的课本和现行的课本却不一样.原高级中学课本《物理》第二册(必修)(以下称旧教材),是这样叙述的:“在任何电场中,每一点的场强E都有一定的方向,所以我们可以在电场中画出一系列从正电荷出 In order to visualize the electric field, the concept of electric field lines was introduced. This provides a lot of convenience for solving problems in electric fields. The description of electric field lines, previous textbooks and current textbooks are not the same. The original high school textbooks The second book (required) (hereinafter referred to as the old textbook) of Physics is described as follows: ”In any electric field, the E of each point has a certain direction, so we can draw a series of Positive charge out