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IEVref: | 121-11-14 | ID: | |

Language: | en | Status: Standard | |

Term: | magnetic constant | ||

Synonym1: | permeability of vacuum [Preferred] | ||

Synonym2: | |||

Synonym3: | |||

Symbol: | μ_{0}
| ||

Definition: | scalar constant linking the electromagnetic quantities and the mechanical quantities, obtained from the relation
$\frac{F}{l}=\frac{{\mu}_{0}}{2\pi}\text{\hspace{0.17em}}\cdot \text{\hspace{0.17em}}\frac{\left|{I}_{1}{I}_{2}\right|}{d}$ where Note 1 to entry: In a vacuum, the product of the magnetic constant and the magnetic field strength :
B
μ_{0}HNote 2 to entry: The magnetic constant is related to the electric constant Note 3 to entry: The value of the magnetic constant is equal to 1,256 637 062 12(19) × 10 | ||

Publication date: | 2021-01 | ||

Source: | |||

Replaces: | 121-11-14:1998-08 | ||

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CO remarks: | |||

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Domain5: |

$\frac{F}{l}=\frac{{\mu}_{0}}{2\pi}\text{\hspace{0.17em}}\cdot \text{\hspace{0.17em}}\frac{\left|{I}_{1}{I}_{2}\right|}{d}$

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 *I*_{1} and *I*_{2}

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* =

Note 2 to entry: The magnetic constant is related to the electric constant *ε*_{0} and to the speed of light in vacuum *c*_{0} by the relation
*μ*_{0}*ε*_{0}*c*_{0}^{2} = 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}.