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法拉第电磁感应定律是高中物理电磁学中一个非常重要的内容,该定律揭示了磁生电现象的规律。在高中阶段,教师对这个知识点的处理往往是这样进行的:通过对感应电流产生条件的探究,得出影响感应电动势大小、感应电流方向的因素,然后再给出法拉第电磁感应定律,即E=n(△φ)/(△t)。这样的处理有个遗憾之处,那就是缺少该规律定量研究的过程。2011年上海的一道高考题给了我们崭新的思路,将定量研究变为可能。下面是这道题的原文:
Faraday’s Law of Electromagnetic Induction is a very important part of high school physics electromagnetism. This law reveals the law of magnetic electromotive phenomenon. In the high school stage, teachers often deal with this point of knowledge by exploring the conditions of the induced current, the factors that influence the size of the induced electromotive force and the direction of the induced current, and then give the law of Faraday’s electromagnetic induction, that is, E = n (Δφ) / (Δt). There is a regrettable point about such a process, which is the lack of a quantitative study of the law. A 2011 college entrance examination in Shanghai gave us a brand new idea, the quantitative research becomes possible. Here is the original text of this question: