a measure of the magnetic strength of a magnet or current-carrying coil, expressed as the torque per unit magnetic-flux density produced when the magnet or coil is set with its axis perpendicular to the magnetic field m, j Also called magnetic moment Compare electromagnetic moment
magnetic dipole moment
A vector quantity associated with the magnetic properties of electric current loops or, more generally, magnets. It is equal to the amount of current flowing through the loop multiplied by the area encompassed by the loop, and its direction is established by the right hand rule for rotations. It can be thought of as a vector pointing from the south to the north of a magnetic dipole, and is then equal to the length of the dipole times the strength of either of its poles. Also called magnetic moment.
noun, Computers. 1. Also called disk, hard disk. a rigid disk coated with magnetic material, on which data and programs can be stored. 2. . noun 1. (computing) another name for disk (sense 2) magnetic disk A memory device, such as a floppy disk or a hard disk, that is covered with a magnetic coating. […]
noun 1. a portion of a ferromagnetic material where the magnetic moments are aligned with one another because of interactions between molecules or atoms.
noun, Computers. 1. a cylinder coated with magnetic material, on which data and programs can be stored.
- Magnetic epoch
noun 1. (geology) a geologically long period of time during which the magnetic field of the earth retains the same polarity. The magnetic field may reverse during such a period for a geologically short period of time (a magnetic event)