教学讨论

用指标表示法推导电磁场的守恒律

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  • 湖南理工学院物理与电子科学学院,湖南 岳阳414006
李照宇(1986—),男,湖南岳阳人,湖南理工学院物理与电子科学学院讲师,博士,主要从事电磁场与电磁波方面的研究工作.E-mail:lizhaoyu@hnist.edu.cn

收稿日期: 2022-09-13

  修回日期: 2022-12-06

  网络出版日期: 2023-10-18

基金资助

湖南省自然科学基金(2021JJ40223);湖南省教育厅科研项目(20C0908)资助

Derivation of the conservation laws of electromagnetic field using the index notation

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  • School of Physics and Electronic Science, Hunan Institute of Science and Technology, Yueyang, Hunan 414006, China

Received date: 2022-09-13

  Revised date: 2022-12-06

  Online published: 2023-10-18

摘要

本文利用指标表示法推导了电磁场的能量、动量和角动量守恒定律,其特点是:物理思想清晰,推导目的明确;物理量引入自然、意义明了;数学运算方便,难度相对较低.

本文引用格式

李照宇 . 用指标表示法推导电磁场的守恒律[J]. 大学物理, 2023 , 42(9) : 16 . DOI: 10.16854/j.cnki.1000-0712.220460

Abstract

This paper uses the index notation to derive the laws of conservation of energy, momentum and angular momentum of the electromagnetic field, which is characterized by clear physical ideas and unequivocal direction of derivation; natural introduction and intelligible meaning of physical quantities; convenient mathematical operations and relatively low difficulty.


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