The magnetic effect of current is discovered by

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John Ambrose Flemming

Hans Christian Oersted

Michael Faraday

Andre-Marie Ampere

answer is B.

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Detailed Solution

Concept: A current flowing in a wire produces a magnetic field around it, which is known as the magnetic effect of current. It concludes that a current running in a wire constantly produces a magnetic field surrounding it, and that the magnetic effect of current is used by the electric motor, telephone, and radio.
Hans Christian Oersted discovered the magnetic effect of electric current in the year 1982. On April 21, 1820, Oersted announced his discovery that a nearby electric current deflected a compass needle from magnetic north, demonstrating a direct relationship between electricity and magnetism.
Hans Christian Oersted made an unexpected remark.
When the electric current from the battery he was using was switched on and off while he was setting up his materials, he noticed a compass needle bent away from magnetic north. This deflection persuaded him that magnetic fields, like light and heat, radiate from all sides of a wire carrying an electric current, confirming the existence of a direct relationship between electricity and magnetism.
The "Oersted" CGS unit of magnetic induction is called after his contribution to the field of electromagnetic.
Hence, option 2 is correct.

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