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

Language: | en | Status: Standard | |

Term: | magnetic constant | ||

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

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Synonym3: | |||

Symbol: | μ_{0}
| ||

Definition: | scalar constant μ_{0} 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 – In vacuum, the product of the magnetic constant and the magnetic field strength :
B
μ_{0}HNOTE 2 – The magnetic constant is related to the electric constant NOTE 3 – The value of the magnetic constant is exactly equal to 4π × 10 | ||

Publication date: | 1998-08 | ||

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Internal notes: | 2017-06-02: Cleanup - Remove Attached Image 121-11-14.gif | ||

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

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}
**H** is equal to the magnetic flux density * B*:

* B* =