Three indentical closed coils A,B and C are placed with their planes parallel to one another. Coils A and C carry equal currents as shown in fig. Coils B and C are fixed in position and coil A is moved towards B with uniform motion. Is there any indenced current in B? If no, give reasons. If yes mark the direction of the induced current in he diagram.

Answer

A, C, D

Explanation

When the coil A moves towards B, the number of magnetic lines of force passing through B changes. Therefore, an induced emf and hence induced current is produced in B.
The direction of current in B will be such as to oppose the field change in B and therefore, will be in the opposite direction of A.