Electrodynamics

Electrodynamics studies electric and magnetic fields that vary with time and interact dynamically, including how charges and currents produce fields and respond to them.

Maxwell's equations: Four equations describing how electric and magnetic fields relate to charges, currents, and one another. They provide the central field laws of classical electrodynamics.
Electric charge: A fundamental property of matter that determines its electromagnetic interactions. Charge density and current density enter the field equations as sources.
Coulomb's law: A law giving the electrostatic force between two point charges in terms of their separation. It describes the static electric limit that electrodynamics extends.
Antenna: A device that transmits or receives electromagnetic waves by converting between fields and electrical signals. Antenna design applies electrodynamics to controlled radiation and reception.
Electrostatics: The study of electric charges and fields that do not vary with time. It is the static limit, without the dynamical coupling of electric and magnetic fields.
Lorentz force: The force on a charged particle moving through electric and magnetic fields. It specifies how the fields act back on charged matter.
Electric field: A vector field that gives the electric force per unit positive test charge at each point. Its time variation is one half of the coupled electromagnetic dynamics.
Ampère's circuital law: A law relating magnetic fields around a loop to the electric current passing through it. Its original form captured steady currents before Maxwell's extension.
Radio wave: An electromagnetic wave used for communication, radar, and other technologies. Radio transmission is a practical use of time-varying fields and radiation.
Magnetostatics: The study of steady magnetic fields produced by constant currents and fixed magnetic moments. It treats magnetic fields without time-dependent induction or radiation.

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