Magnetic energy: Difference between revisions
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This second expression forms the basis for [[superconducting magnetic energy storage]]. |
This second expression forms the basis for [[superconducting magnetic energy storage]]. |
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Energy is also stored in a magnetic field. The energy per unit volume in a region of space of permeability <math>\mu</math> containing magnetic field |
Energy is also stored in a magnetic field. The energy per unit volume in a region of space of permeability <math>\mu</math> containing magnetic field '''B''' is: |
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::<math>u={1\over 2}{B^2 \over \mu}</math> |
::<math>u={1\over 2}{B^2 \over \mu}</math> |
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Revision as of 20:14, 22 September 2013
Magnetic energy and electric energy are related by Maxwell's equations. The potential energy of a magnet of magnetic moment m in a magnetic field B is defined as the work of magnetic force (actually of magnetic torque) on re-alignment of the vector of the magnetic dipole moment, and is equal:
while the energy stored in an inductor (of inductance L) when current I is passing via it is
- .
This second expression forms the basis for superconducting magnetic energy storage.
Energy is also stored in a magnetic field. The energy per unit volume in a region of space of permeability containing magnetic field B is:
See also
External links
- Magnetic Energy, Richard Fitzpatrick Professor of Physics The University of Texas at Austin.