大学物理 ›› 2010, Vol. 29 ›› Issue (11): 23-23.

• 著者文摘 • 上一篇    下一篇

一种简单推导匀速转动电偶极子电磁辐射的方法

陈明东[1] 韩光泽[2] 郭平生[3]   

  1. [1]华南理工大学广州汽车学院,广东广州510800 [2]华南理工大学物理系,广东广州510641 [3]广西师范大学物理与信息工程学院,广西桂林541700
  • 出版日期:2010-11-25 发布日期:2010-11-20

A simple method to derive electromagnetic radiation for uniform rotational electric dipoles

  • Online:2010-11-25 Published:2010-11-20

摘要: 电偶极子在绕其中心转动时,正负电荷作加速运动,因此转动的电偶极子会辐射电磁波.利用运动电荷的磁感应强度公式,推导出匀速转动的刚性电偶极子在近场区产生变化磁场的表达式;结合电磁场建立的推迟效应,推导了非相对论情形时、匀速转动电偶极子在远场区的电磁辐射公式,并对比了匀速转动电偶极子辐射与谐振电偶极子辐射的异同.

关键词: 电偶极子, 远场区, 推迟效应

Abstract: Positive and negative electric charges will undertake accelerated motion when the electric dipole rotates by its center, so the rotational electric dipole will radiate electromagnetic wave. With the formula of magnetic induction intensity produced by electric charge in motion, an expression of variation magnetic field is derived, which is produced by a uniform rotational electric dipole near itself. With the retarding effect of building electromagnetic field, an expression of electromagnetic radiation in far field is also derived for a uniform rotational electric dipole in the non-relative theory. And then comparisons of the similarities and differences in electromagnetic radiation between the uniform rotational electric dipole and the oscillation electric dipole are carried out.

Key words: electric dipole, far field, retarding effect

中图分类号: 

  • O441.4