Magnetostatics

Magnetostatics is the study of magnetic fields in systems where the electric currents are steady (not changing with time).[1]

Electromagnetism
Electricity · Magnetism · Magnetic permeability
Electrostatics
Electric charge • Coulomb's law •
Electric field • Electric flux •
Gauss's law • Electric potential energy •
Electric potential • Electrostatic induction •
Electric dipole moment • Polarization density
Magnetostatics
Ampère's law • Electric current • Magnetic field •
Magnetization • Magnetic flux • Biot–Savart law •
Magnetic dipole moment • Gauss's law for magnetism
Electrodynamics
Lorentz force law • emf • Electromagnetic induction • Faraday’s law • Lenz's law • Displacement current • Maxwell's equations • EM field • Electromagnetic radiation • Liénard–Wiechert potential • Maxwell tensor • Eddy current
Electrical Network
Electrical conduction • Electrical resistance • Capacitance •
Inductance • Impedance • Resonant cavities • Waveguides
Covariant formulation
Electromagnetic tensor • EM Stress-energy tensor • Four-current • Electromagnetic four-potential

Magnetostatics is widely used in magnetic storage devices such as in computer memory. Magnetostatic focussing can be got by a permanent magnet or by passing a current through a coil of wire whose axis coincides with the beam axis.

References
  1. Aharoni, Amikam 1996. Introduction to the theory of ferromagnetism. Oxford:Clarendon Press. ISBN 0-19-851791-2


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