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प्रश्न
What did Hans Christian Oersted show in 1820?
विकल्प
Magnetic field lines intersect each other.
Earth has no magnetic field.
Cutting a magnet produces an isolated north pole.
Electric current produces a magnetic effect.
MCQ
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उत्तर
In 1820, Hans Christian Oersted showed that electric current produces a magnetic effect. This finding connected the study of electricity with magnetism.
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