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Coulomb interaction according to classical radiation theory

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A particle with mass m and electric charge q is bound by the Coulomb interaction to an infinitely massive particle with electric charge -q. At t=0 its orbit is (approximately) a circle of radius R. At what time will it have spiralled into R/2? (Assume that R is large enough so that you can use the classical radiation theory than quantum
mechanics.)

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The expert examines Coulomb interactions according to classical radiation theory.

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