How much does the maximum EMF produced by a generator a rotating coil) change if its magnetic field is halved?
A) It is the same.
B) It is increased by a factor of 16.
C) It is decreased by a factor of 2.
D) It is increased by a factor of 4.
E) It is impossible to tell given the information provided.

Question

Quizplus · Accepted Answer

The maximum EMF produced by a generator is given by the formula Emax = NBAω, where N is the number of turns in the coil, B is the magnetic field, A is the area of the coil, and ω is the angular velocity of the generator. If the magnetic field is halved, then Emax will decrease by a factor of 2, since it is directly proportional to B. Therefore, the correct answer is (C) It is decreased by a factor of 2.

How Much Does the Maximum EMF Produced by a Generator