The Magnetic effect of current was discovered by:

John Ambrose Fleming

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Hans Christian Oersted

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Michael Faraday

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André-Marie Ampère

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Solution

The correct option is D Hans Christian Oersted
The magnetic effect of an electric current was discovered by Hans Christian Oersted in 1820. He demonstrated the effect by plotting compass close to a long straight wire which is carrying current and noting it's deflection. And the by reversing the direction of the current, the compass needle was deflected in the opposite sense.

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