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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 μ0 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 – In 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 – 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 – The value of the magnetic constant is exactly equal to

4π × 10−7 m kg s−2 A−2 = 1,256 637 061 4... μH/m


Publication date:1998-08
Source:
Replaces:
Internal notes:2017-06-02: Cleanup - Remove Attached Image 121-11-14.gif
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