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The discovery that an ELECTRIC CURRENT produces a magnetic field around it was made in 1820 by:
AMichael Faraday, in his electromagnetic induction work
BHans Christian Oersted, by deflecting a compass needle
CJames Clerk Maxwell, in his equations of electromagnetism
DThomas Edison, while perfecting the incandescent light bulb
Answer & Solution
Correct answer: B. Hans Christian Oersted, by deflecting a compass needle
Hans Christian Oersted discovered (1820) that an electric current through a wire deflects a nearby compass needle, proving that electric currents produce magnetic fields. This linked electricity and magnetism for the first time.
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