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演示“电磁感应”现象时,导体在磁场中做切割磁力线的运动要靠学生抽象地想象。初中学生抽象思维能力较差,尤其差生感到难以理解,为此我做了一个导体切割磁力线的模型,如图所示。模型的制作方法如下。 1、用软木块做适当大小的蹄形磁铁,并涂以蓝红两种颜色,分别表示N极和S极。 2、在N、S极上分别钻若干细孔,注意两极上孔的位置要上下相对,在同一铅垂线上。
When demonstrating the phenomenon of “electromagnetic induction”, the conductor’s motion of cutting magnetic lines in a magnetic field depends on students’ abstract imagination. The junior high school students’ abstract thinking ability is poor, especially poor students find it difficult to understand. For this reason I made a model of conductor cutting magnetic lines, as shown in the figure. The method of making the model is as follows. 1. Use a cork block to make a properly sized hoof-shaped magnet, painted in both blue and red colors, indicating N and S poles, respectively. 2. Drill several fine holes on the N and S poles respectively. Note that the holes on the two poles must be opposite to each other on the same vertical line.