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电磁感应这部分内容是中学物理的一个重要知识点,有关试题主要分两大类:第一类是仅要求考生能运用楞次定律定性分析有关问题(如线框向左还是向右移动,电流是增大还是减小等等),另一类是与计算感应电动势有关的定量分析问题。本文着重介绍后者中的一些创新试题。这类试题解题关键是:运用法拉第电磁感应定律求出电动势(注:有时是瞬时电动势,有时是平均电动势),常见的问题有:外力瞬时
This section of electromagnetic induction is an important knowledge point for middle school physics. There are two main categories of questions. The first category only requires candidates to use the Lenz’s law to qualitatively analyze relevant issues (such as whether the wireframe moves to the left or right, the current Whether to increase or decrease, etc.) The other is a quantitative analysis problem related to the calculation of induced electromotive force. This article focuses on some of the latter’s innovative test questions. The key to solving such questions is: using the Faraday law of electromagnetic induction to find the electromotive force (Note: sometimes instantaneous electromotive force, sometimes the average electromotive force), the common problems are: external force instantaneous