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Electric field — effect produced by an electric charge that exerts a force on charged objects in its vicinity.

Electromagnetic field — a field composed of two related vector fields, the electric field and the magnetic field.

Electromagnetism — the physics of the electromagnetic field: a field, encompassing all of space, composed of the electric field and the magnetic field.

Magnetism — phenomenon by which materials exert an attractive or repulsive force on other materials.

Magnetohydrodynamics — the academic discipline which studies the dynamics of electrically conducting fluids.