磁通量是电磁感应中的一个重要概念，准确地理解这个概念是学会其它相关知识的基础．为此，教师在教学中有必要向学生讲清有关磁通量的以下三个问题．问题一磁通量究竟是由什么决定的？教材中这样定义磁通量：“穿过某一面积的磁感线条数，就叫做穿过这个面积的磁通量．”... Magnetic flux is an important concept in electromagnetic induction. Understanding this concept accurately is the basis for learning other related knowledge. For this reason, teachers need to explain the following three questions about magnetic flux to students. Question 1 What exactly is the magnetic flux? The magnetic flux is defined in the textbook as follows: “The number of magnetic lines passing through an area is called the magnetic flux passing through this area.”...