# 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 =, where*B/H*is the magnetic flux density of the material or medium, and*B*is the strength of the surrounding magnetic field. Relative*H*__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