教学讨论

关于感生与动生电动势的一点探讨

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  • 1. 北京科技大学 物理系,北京100083;2. 清华大学 物理系,北京100084;3. 北京大学 物理学院,北京100871
刘丽华(1976—),女,河北衡水人,北京科技大学物理系副教授,博士,主要从事物理教学和热电、磁热材料研究工作.
刘丽华,E-mail: lhliu@ustb.edu.cn

收稿日期: 2025-05-30

  修回日期: 2025-06-20

  网络出版日期: 2026-06-04

基金资助

北京科技大学本科教育教学改革重大项目(JG2023ZD06);清华大学教学改革项目(ZY01_02)资助

A brief discussion on induced and motional electromotive force

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  • 1. Department of Physics, University of Science and Technology Beijing, Beijing 100083, China;
    2. Department of Physics, Tsinghua University, Beijing 100084, China;
    3. School of Physics, Peking University, Beijing 100871, China

Received date: 2025-05-30

  Revised date: 2025-06-20

  Online published: 2026-06-04

摘要

文章系统研究了电磁学中感应电动势的分类及其数学推导过程.研究首先针对教学中常见的推演误区进行了剖析,随后基于法拉第电磁感应定律,通过构建物理模型,提出了推导感生电动势和动生电动势的两种有效方法.研究结果表明,两种方法与直接应用莱布尼兹积分定则的数学方法在结论上完全一致.在此基础上,文章进一步结合麦克斯韦方程组,在普通物理学的理论框架内对感生和动生电动势的物理本质进行了探讨.这种将理论推导与物理本质分析相结合的研究方法,不仅保证了数学推导的严谨性,同时通过揭示电磁感应现象的内在规律,为大学低年级学生理解电磁感应的物理本质提供了清晰的理论框架,对电磁学课程的教学实践具有参考价值.



本文引用格式

刘丽华, 王宇航, 许军军, 甄昕 . 关于感生与动生电动势的一点探讨[J]. 大学物理, 2026 , 45(3) : 21 . DOI: 10.16854/j.cnki.1000-0712.250294

Abstract

This paper systematically investigates the classification of induced electromotive force (EMF) in electromagnetism and its mathematical derivation process. The study first analyzes common misconceptions in pedagogical approaches, then proposes two effective methods for deriving motional and induced EMF based on Faradays law of electromagnetic induction through constructed physical models. The results demonstrate complete consistency between these methods and the direct application of Leibniz integral rule in their conclusions. Furthermore, within the theoretical framework of general physics, the study explores the physical essence of motional and induced EMF by incorporating Maxwells equations. This research methodology, which combines rigorous theoretical derivation with analysis of physical principles, not only ensures mathematical precision but also provides a clear conceptual framework for undergraduate students to comprehend the fundamental nature of electromagnetic induction. By revealing the intrinsic laws governing electromagnetic phenomena, this work offers valuable insights for the teaching practice of electromagnetism courses.

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