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A magnetic moment may have a macroscopic origin in a bar magnet or a current loop, for example, or microscopic origin in the spin of an elementary particle like an electron, or in the [[angular momentum]] of an atom. | A magnetic moment may have a macroscopic origin in a bar magnet or a current loop, for example, or microscopic origin in the spin of an elementary particle like an electron, or in the [[angular momentum]] of an atom. | ||
===Macroscopic | ===Macroscopic examples=== | ||
===Microscopic | ===Microscopic examples=== | ||
==Notes== | ==Notes== | ||
<references/> | <references/> | ||
Revision as of 17:54, 18 December 2010
Magnetic moment
In physics, the magnetic moment of an object is a vector property, denoted here as m, that determines the torque, denoted here by τ, it experiences in a magnetic flux density B, namely τ = m × B (where × denotes the vector cross product). As such, it also determines the change in potential energy of the object, denoted here by U, when it is introduced to this flux, namely U = −m·B.[1]
Origin
A magnetic moment may have a macroscopic origin in a bar magnet or a current loop, for example, or microscopic origin in the spin of an elementary particle like an electron, or in the angular momentum of an atom.
Macroscopic examples
Microscopic examples
Notes
- ↑ V. P. Bhatnagar (1997). A Complete Course in ISC Physics. Pitambar Publishing, p. 246. ISBN 8120902025.