Question

A square loop is placed near long straight current carrying wire as shown in figure. Match the following table.

Answer 1

(A) When the current in the wire is increased, the magnetic flux going into the plane of the loop increases. To oppose this change, an anticlockwise current will be induced in the wire. As the part of the loop near the wire carries current in a direction antiparallel to that of wire, it will repel the wire.

(B) When the current in the wire is decreased, the magnetic flux going into the plane of the loop decreases. To oppose this change, a clockwise current will be induced in the wire. As the part of the loop near the wire carries current in a direction parallel to that of wire, it will attract the wire.

(C) When the loop is moved away from the wire, the magnetic flux going into the plane of the loop decreases. To oppose this change, a clockwise current will be induced in the wire. As the part of the loop near the wire carries current in a direction parallel to that of wire, it will attract the wire.

(D) When the loop is moved towards the wire, the magnetic flux going into the plane of the loop increases. To oppose this change, an anticlockwise current will be induced in the wire. As the part of the loop near the wire carries current in a direction antiparallel to that of wire, it will repel the wire.