Magnetic energy

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:

E_{\rm {p,m}}=-m\cdot B

while the energy stored in an inductor (of inductance, L) when current, I, is passing via it is

E_{\rm {p,m}}={1 \over 2}LI^{2}

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:

u={1 \over 2}{B^{2} \over \mu }

External links

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

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