Question

The magnetic effect of electric current was discovered by
A Maxwell
B Oersted
C Ampere
D none of these

Answer 1

Hint: Here we will proceed with the meaning of current's magnetic effect and then we will try to show who discovered current's magnetic effect. Oersted, Law is the law that creates a magnetic field around it by a steady electric current. This was discovered by the Danish physicist Hans Christian on April 21, 1820.

Complete answer:
A current magnetic effect means that a current flowing in a wire generates a magnetic field around it. It concludes that a current flowing into a wire always gives rise to a magnetic field around it, all using the magnetic effect of current, the electric motor, telephone and radio.

Hans Christian Oersted discovered the magnetic effect of electric current in the year $1982 .$ On 21 April 1820, Oersted published his discovery that a compass needle was deflected by a nearby electric current from the magnetic north, confirming a direct relationship between electricity and magnetism.

A surprising observation was made by Hans Christian Oersted. As he was setting up his materials, when the electric current from the battery he was using was switched on and off, he noticed a compass needle deflected away from the magnetic north. This deflection convinced him that just as light and heat do, magnetic fields radiate from all sides of a wire carrying an electric current, and that a direct relationship between electricity and magnetism was confirmed. In honor of his contribution to the field of electromagnetism, the CGS unit of magnetic induction "Oersted" is named.

Hence, the correct option is B.

Note:
Whenever we come up with this kind of issue, we are asked to find out about the discovery of a theory. Then first by observing the history of the current magnetic field, we write the history of the theory as in the question, we discover how H.C. Oersted found out.