In 1820, Danish physicist Hans Christian Ørsted discovered that electric current flowing through a wire produces a magnetic field, as evidenced by a compass needle deflecting when placed near a current-carrying wire during a lecture demonstration.
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Evidence Quote
“A Danish professor named Ørsted was running a lecture demo and he happened to leave a compass sitting near a wire. When he switched the current on, the compass needle twitched.”
Created: 8/12/2026, 1:45:11 AM
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