We show that a charged sphere moving at a constant velocity v exhibits a mass due to electromagnetic radiation, expressed as 4/(3+(v/c)²) (E/c²), where E is the electromagnetic energy and c the speed of light in vacuum. Our finding reconciles the longstanding mismatch between the electromagnetic mass calculated from the classical electrodynamics' 4/3 (E/c²) and the relativistic theory.
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Exirifard et al. (2024) studied this question.
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