In physics, the electromagnetic dual concept is based on the idea that, in the static case, electromagnetism has two separate facets: electric fields and magnetic fields.

• The electric field is the dual of the magnetic field.
• The electric flux density is the dual of the magnetic flux density.
• Faraday's law is the dual of Ampere's law.
• Guass's law for electric charge is the dual of Gauss's law for magnetic monopoles.
• The electrostatic potential is the dual of the magnetic vector potential.
• Permittivity is the dual of permeability.
• Piezoelectricity is the dual of magnetostriction.
• Ferroelectrics (or electrets) are the dual of ferromagnets.
• an electrostatic motor is the dual of a magnetic motor;
• Electrets are the dual of permanent magnets;
• The Faraday effect is the dual of the Kerr effect.

See also

• Maxwell's equations
• Duality (electrical circuits)