Question

The magnetic needle (wounded by wire of the circuit) changes its direction when a current starts flowing in the circuit.​

Answer 1

Answer:

Hans Oersted, in 1820, first discovered that when an electric current is passed through a conducting wire, a magnetic field is produced around it. If a compass needle is kept in the vicinity of the current carrying wire, the needle is found to deflect in a definite direction. If the direction of current in the wire is reversed, Then the direction of deflection of the needle is reversed.