View your list of saved words. (You can log in using Facebook.)
Relative increase or decrease in the magnetic field inside a material compared with the magnetic field in which the material is located. In empty space the magnetic permeability is 1, because there is no matter to modify the field. Materials may be classified by the value of their magnetic permeability. Diamagnetic materials (seediamagnetism) have constant relative permeabilities of slightly less than 1. Paramagnetic materials (seeparamagnetism) have constant relative permeabilities of slightly more than 1. The relative permeability of ferromagnetic materials (seeferromagnetism) increases as the magnetizing field increases, reaches a maximum, and then decreases. Pure iron and some alloys have relative permeabilities of 100,000 or more.
This entry comes from Encyclopædia Britannica Concise. For the full entry on magnetic permeability, visit Britannica.com.
Seen & Heard
What made you look up magnetic permeability? Please tell us what you were reading, watching or discussing that led you here.