Categories: Magnetism | Physical quantity
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In electromagnetism, permeability is the degree of magnetisation of a material in response to a magnetic field. Absolute permeability is represented by the symbol μ. In SI units, permeability is measured in henrys per metre.
μ is the permeability, measured in henrys per metre
B is the magnetic flux density (also called the magnetic induction) in the material, measured in teslas
H is the magnetic field strength, measured in amperes per metre
Absolute permeability is represented by the symbol μ0 and is the permeability of the vacuum, where μ0 = 4π × 10−7 N A−2 (exactly).
Together with permittivity, permeability defines the speed of light.
Relative permeability, sometimes denoted by the symbol μr, is the ratio of the permeability of a specific medium to the permeability of free space μ0: