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प्रश्न
In 1820, Hans Christian Oersted noticed that a compass needle deflected near a current-carrying wire. What did this observation prove for the first time?
विकल्प
Magnetic fields produce electric currents
Current-carrying wires produce electric charges
Electric currents produce magnetic fields
Compass needles are deflected by electric fields
MCQ
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उत्तर
Oersted's observation of a deflecting compass needle near a current-carrying wire proved for the first time that electric currents produce magnetic fields. This established the connection between electricity and magnetism and motivated further quantitative study.
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