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:

If the magnetic field is an area in the x, y directions, then 3D fundamental magnoflux energy may be formed by applying a voltage at right angles in the z direction.

External links[edit]

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