| MAG | (physics) the angle that a magnetic needle makes with the plane of the horizon |
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| MAG | the amount of magnetic flux in a unit area perpendicular to the direction of magnetic flow |
| MAG | the process that makes a substance magnetic (temporarily or permanently) |
| MAG | the amount of magnetic flux in a unit area perpendicular to the direction of magnetic flow |
| MAG | an oxide of iron that is strongly attracted by magnets |
| MAG | high-speed rail technology |
| MAG | a line of force in a magnetic field |
| MAG | an imaginary line passing through both magnetic poles of the Earth |
| MAG | a marine mine that is detonated by a mechanism that responds to magnetic material (as the steel hull of a ship) |
| MAG | the torque exerted on a magnet or dipole when it is placed in a magnetic field |
| MAG | a hypothetical particle with a single magnetic pole instead of the usual two |
| MAG | a slender magnet suspended in a magnetic compass on a mounting with little friction |