Question

A rectangular coil of copper wire is rotated in a magnetic field. The direction of the induced current in the coil changes after:

• A. every one-fourth rotation
• B. every half rotation
• C. every one rotation
• D. every two rotations

Hint:

In AC generators, the current reverses direction every half rotation due to change in magnetic flux.

Answer 1

The Correct Option is B

According to Faraday’s Law, a rotating coil in a magnetic field experiences a change in magnetic flux, inducing an alternating current. The direction of the current reverses every half rotation due to the reversal of the relative motion of the coil with respect to the field.
Thus, the correct answer is \( \mathbf{(B) \text{every half rotation}} \).