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Answer: 4. An accelerating charge

Key idea: electromagnetic waves are produced by accelerated (time-varying) charges.

A charge at constant velocity gives a steady current and a constant magnetic field, with no radiation. A stationary charge gives only a static electric field. A chargeless particle produces no field. An accelerating charge produces changing electric and magnetic fields that propagate as a wave.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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