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人教版《物理》选修3-2第四章《电磁感应》主要研究如何才能产生感应电流.考试经常从微观的角度考查电磁感应产生的机理,这就要求学生对电磁感应现象的产生有一个深层理解.笔者认为,在实际教学过程中,应把问题产生的实质交代清楚,以使学生理清知识的来龙去脉,抓住知识点的核心,加深对本部分内容的理解.问题一如图1所示,在匀强磁场中,MN、PQ是两条平行金属导轨,而ab、cd为串有电压表和电流表的两根金属棒,两只电表可看成理想电表.当两棒
People’s Education Edition “Physical” Elective 3-2 Chapter 4, “Electromagnetic Induction,” the main study on how to produce induced current. Examination often from a micro perspective to examine the mechanism of electromagnetic induction, which requires students to generate electromagnetic induction phenomenon Deep understanding.I believe that in the actual teaching process, the essence of the problem should be made clear, so that students clarify the ins and outs of knowledge, grasp the core of knowledge point, deepen the understanding of this part of the content. Show, in the uniform magnetic field, MN, PQ is two parallel metal rails, and ab, cd string with a voltmeter and ammeter two metal rods, two meters can be seen as the ideal meter .When the two rods