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磁力线是为了研究磁场的性质而假想出来的,实际上磁场中并不存在着这些线。在教学中发现,学生对“北极在某点所受的磁力方向跟该点的磁力线方向一致,南极所受的磁力方向跟该点的磁力线方向相反”不容易理解和掌握。为此我们设计了如下实验,实践证明,效果很好。实验器材:条形磁铁一个(长约18cm),针一枚(长约7cm),有机玻璃器皿一个,软木塞一个(用蜡浸泡一下)。实验步骤:1.先将针磁化,一端为 N 极,一端为 S
Magnetic lines are supposed to study the properties of magnetic fields. In reality, these lines do not exist in magnetic fields. In the teaching, students found that the magnetic direction of the North Pole at a certain point is consistent with the direction of the line of magnetic force at that point. The direction of the magnetic force of the South Pole is opposite to the magnetic line of the point. It is not easy to understand and grasp. For this reason, we designed the following experiment. Practice has proved that it works well. Laboratory equipment: One bar magnet (about 18cm long), one needle (about 7cm long), one plexiglass utensil, one cork stopper (soaked in wax). Experimental procedure: 1. Magnetize the needle first, with N pole at one end and S at one end