The area of a loop of wire is reduced by a factor of 2 while the rate of change of magnetic field applied is doubled. What happens to the induced emf in that loop of wire?
A) It is doubled.
B) It is reduced by a factor of 2.
C) It is reduced by a factor of 4.
D) It is quadrupled.
E) It stays the same.

Question

Quizplus · Accepted Answer

The induced emf is given by Faraday's law of electromagnetic induction, which states that the emf is proportional to the rate of change of magnetic flux. Since the area is halved and the rate of change of the magnetic field is doubled, the overall change in magnetic flux remains the same, keeping the induced emf unchanged.

The Area of a Loop of Wire Is Reduced by a Factor