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本文介绍一个甚为简易的演示实验,它既能够验证地磁场的存在,又能够通过适当变动,确定出地磁场的磁力线方向.准备一只量程较小的普通的电流计和一根长约8 m的软导线,把导线两端跟电流计相连.由两个学生相隔一段距离,拿起导线如若转跳绳那样使导线转起来.电流计的指针发生明显的偏转,说明了地磁场的存在.如果接着让这两个学生一边转导线,一边以两
This paper presents a very simple demonstration experiment, which can verify the existence of the geomagnetic field, but also through appropriate changes to determine the direction of the magnetic field lines of geomagnetic field.Preparation of a small range of normal ammeter and a length of about 8 m of the soft wire, the ends of the wire connected to the ammeter by two students separated by a distance, pick up the wire as if the jump rope so that the wires turn up the galvanometer pointer obvious deflections, indicating the existence of the geomagnetic field. If you then let the two students while turning the wire, while two