The Larmor formula describes the power radiated by an accelerating charged particle, particularly in the context of classical electrodynamics. It is named after the British physicist Joseph Larmor, who derived the formula in the early 20th century.
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The nonrelativistic radiated power of an accelerated point charge is in SI units. Integrating its dipole radiation pattern over solid angle gives this result; relativistic motion requires the Lienard generalization.