Question

A rectangular coil ABCD of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each :

• A. Two revolutions
• B. One revolution
• C. Half revolution
• D. One-fourth revolution

Answer 1

The correct option is C

Half revolution

The direction of induced current in the arm AB reverses direction once a half of one revolution is complete because the direction of motion of the conductor is reversed. Similarly current in the arm CD changes its direction at the same time. Thus the current changes direction once every half of a revolution.