Who discovered when an compase needle is kept near the electric circuit in which current is flowing it deflect?
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Hans Christian Oersted, one of the leading scientists of the 19th century, played a crucial role in understanding electromagnetism.In 1820 he accidentally discovered that a compass needle got deflected when an electric current passed through a metallic wire placed nearby.
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the given figures show the path of light through lenses of two different types represent by rectangular boxes A and B
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