# magnetic permeability

## Definitions

### Electronics

- Its
__symbol__ is μ. A quantitative __indicator__ of the __response__ of a material or medium to a magnetic field. It is expressed by the following formula: μ = *B/H*, where *B* is the magnetic flux density of the material or medium, and *H* is the strength of the surrounding __magnetic__ field. Relative permeability is obtained using the following formula: μ_{r} = μ/μ_{0}, where μ_{r} is relative permeability, and μ_{0} is the permeability of free space. The absolute permeability of free space is a __physical__ __constant__ __equal__ to approximately 1.256637 × 10^{-6} henry per meter, and its relative permeability is equal to 1, as seen by the this __formula__. Materials whose relative permeability is less than 1 are __diamagnetic__, those slightly above 1 are paramagnetic, and those substantially above 1 are __ferromagnetic__. Also known as magnetic conductivity, or permeability (1). - synonymmagnetic conductivity

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