Magnetic energy

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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 mechanical 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, μ, containing magnetic field, B, is:

External links[edit]

  • Magnetic Energy, Richard Fitzpatrick Professor of Physics The University of Texas at Austin.