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粤教版高中物理选修3-2第一章第三节“感应电流的方向”利用电流表指针的偏转方向来确定感应电流的方向,从而归纳得出楞次定律。该实验较难引起学生的学习兴趣。笔者通过改进实验器材,用超强磁铁代替普通条形磁铁,用发光二极管代替电流表,这样产生的感应电流就足以点亮发光二极管,从而激发学生的好奇心,让学生产生强烈的求知欲望。一、实验原理根据电磁感应规律,当超强磁铁插入或者拔出螺线管时,通过螺线管内部的磁通量将发生变化,使
Guangdong Education High School Physics Elective 3-2 Chapter 1 Section III “The direction of the induced current ” The use of ammeter pointer deflection direction to determine the direction of the induced current, thus concluding Lenz’s law. The experiment is harder to arouse students’ interest in learning. The author through the improvement of experimental equipment, with super magnets instead of ordinary bar magnet, LED instead of ammeter, the resulting induction current is sufficient to light the light-emitting diode, thereby stimulating student curiosity, so that students have a strong desire for knowledge. First, the experimental principle According to the law of electromagnetic induction, when the super-strong magnet inserted or pulled out of the solenoid, the magnetic flux through the solenoid will change so that