User:John R. Brews/Sample: Difference between revisions
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==Magnetic moment== | ==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 product|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'''.<ref name=Bhatnagar> | 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 product|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'''.<ref name=Bhatnagar> | ||
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==Origin== | ==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. | 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 magnetic moment== | ===Macroscopic magnetic moment=== | ||
===Microscopic magnetic moment=== | ===Microscopic magnetic moment=== | ||
Revision as of 17:50, 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]
Notes
- ↑
V. P. Bhatnagar (1997). A Complete Course in ISC Physics. Pitambar Publishing, p. 246. ISBN 8120902025.
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 magnetic moment
===Microscopic magnetic moment===