大学物理 ›› 2023, Vol. 42 ›› Issue (9): 16-.doi: 10.16854/j.cnki.1000-0712.220460

• 教学讨论 • 上一篇    下一篇

用指标表示法推导电磁场的守恒律

李照宇   

  1. 湖南理工学院物理与电子科学学院,湖南 岳阳414006
  • 收稿日期:2022-09-13 修回日期:2022-12-06 出版日期:2023-10-16 发布日期:2023-10-18
  • 作者简介: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
  • 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

LI Zhao-yu   

  1. School of Physics and Electronic Science, Hunan Institute of Science and Technology, Yueyang, Hunan 414006, China
  • Received:2022-09-13 Revised:2022-12-06 Online:2023-10-16 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.

关键词: 指标法, 电磁场, 能量守恒律, 动量守恒律, 角动量守恒律

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.


Key words:  index notation, electromagnetic field, conservation law of energy, conservation law of momentum, conservation law of angular momentum