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纵览近几年高考,关于电磁感应中的双金属棒问题层出不穷,这类问题为何能成为高考热点?笔者认为有以下两方面原因:1.这类问题综合性强,物理过程复杂,试题的覆盖面广,能集力学、电学的重点、难点于一身,不仅能考查学生对基本概念、基本规律的理解程度,还能考查学生的解题能力与技巧.而且,解这类问题通常要进行受力分析,可以考查学生对动能定理、动量守恒定律、动量定理、牛顿运动定律、全电路欧姆定律、法拉第电磁感应定律等规律的综合运用.2.能增加区分度,适合高考这样的选拔性考试.这
Looking at the college entrance examination in recent years, the problem of bimetallic rods in electromagnetic induction emerges in an endless stream. Why do these problems become hotspots for the college entrance examination? The author thinks that there are two reasons for this: 1. This type of problem has a comprehensive and complex physical process, covering the questions. Guang can gather the key points and difficulties of mechanics and electricity. It can not only examine students’ understanding of basic concepts and basic laws, but also examine students’ problem-solving abilities and skills. Moreover, solving such problems usually requires exertion of force. The analysis can examine students’ comprehensive application of kinetic energy theorem, momentum conservation theorem, momentum conservation theorem, Newton’s law of motion, full-circuit Ohm’s law, Faraday’s law of electromagnetic induction, etc. 2. Can increase differentiation, suitable for such entrance examinations. This