请输入您要查询的字词:

 

单词 magnetic field
释义 magnetic field
A field of force that exists around a magnetic body (see magnetism) or a current-carrying conductor. Within a magnetic field a magnetic dipole may experience a torque and a moving charge may experience a force. The strength and direction of the field can be given in terms of the magnetic flux density (or magnetic induction ), symbol B; it can also be given in terms of the magnetic field strength (magnetizing force or magnetic intensity ), symbol H.
The magnetic flux density is a vector quantity and is the magnetic flux per unit area of a magnetic field at right angles to the magnetic force. It can be defined in terms of the effects the field has, for example by
B = F/qvsinθ
, where F is the force a moving charge q would experience if it was travelling at a velocity v in a direction making an angle θ with that of the field. The SI unit is the tesla.
The magnetic field strength is also a vector quantity and is related to B by:
H = B
where µ is the permeability of the medium. The SI unit of field strength is the ampere per metre (A m-1)
随便看

 

物理辞典收录了3346条物理词条,基本涵盖了常用物理知识及物理英语单词词组的翻译及用法,是物理学习的有利工具。

 

Copyright © 2000-2023 Newdu.com.com All Rights Reserved
更新时间:2025/6/23 3:17:27