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IEVref:121-11-14ID:
Language:enStatus: Standard
Term: magnetic constant
Synonym1: permeability of vacuum
[Preferred]
Synonym2:
Synonym3:
Symbol: μ0
Definition: scalar constant linking the electromagnetic quantities and the mechanical quantities, obtained from the relation

F l = μ 0 2π | I 1 I 2 | d MathType@MTEF@5@5@+=feaagCart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaamaalaaabaGaamOraaqaaiaadYgaaaGaeyypa0ZaaSaaaeaacqaH8oqBdaWgaaWcbaGaaGimaaqabaaakeaacaaIYaacdaGae8hWdahaaiaaysW7cqGHflY1caaMe8+aaSaaaeaadaabdaqaaiaadMeadaWgaaWcbaGaaGymaaqabaGccaWGjbWaaSbaaSqaaiaaikdaaeqaaaGccaGLhWUaayjcSdaabaGaamizaaaaaaa@4A54@

where F/l is the magnitude of the lineic force between two straight parallel conductors of infinite length and negligible circular cross-section, placed at a distance d apart in vacuum and carrying electric currents I1 and I2

Note 1 to entry: In a vacuum, the product of the magnetic constant and the magnetic field strength H is equal to the magnetic flux density B:

B = μ0H

Note 2 to entry: The magnetic constant is related to the electric constant ε0 and to the speed of light in vacuum c0 by the relation μ0ε0c02 = 1.

Note 3 to entry: The value of the magnetic constant is equal to 1,256 637 062 12(19) 10−6 N A−2.


Publication date:2021-01
Source:
Replaces:121-11-14:1998-08
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