Permeability of free space

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The permeability of free space, μ₀, is a physical constant used often in electromagnetism. It is taken to have the exact value of 4π x 10^-7 N/A² (newtons per ampere squared).^[1] It is connected to the energy stored in a magnetic field, see Hyperphysics for specific equations.

It is related to the speed of light by the equation

$c = \frac{1}{\sqrt{\mu_0 \epsilon_0}}$

where

$c$ is the speed of light and
$\epsilon_0$ is the permittivity of free space.

Visit Hyperphysics for more information on this constant.

References

↑ Hyperphysics. (August 28, 2015). Electric field [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html

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