magnetic moment

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The product of the pole strength of a magnet and the distance between the poles.

from the GNU version of the Collaborative International Dictionary of English.

• noun The torque exerted on a magnet or dipole when it is placed in a magnetic field.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun physics The torque exerted on a magnet within a magnetic field; a vector, being the product of the strength of the magnet and the distance between its poles.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the torque exerted on a magnet or dipole when it is placed in a magnetic field