An Etymological Dictionary of Astronomy and Astrophysics

1. Same as → magnetic flux density.
   

2. The production of a magnetic field in a piece of un-magnetized iron or other → ferromagnetic substance when a magnet is brought near it.
   The magnet causes the individual particles of iron, which act like tiny magnets, to line up so that the sample as a whole becomes magnetized.

See also: → magnetic; → induction.