A loop of wire is rotated about a diameter (which is perpendicular to a given magnetic field.) In one revolution the induced current in the loop reverses direction how many times?
A) 4
B) 1
C) 0
D) 3
E) 2

Question

Quizplus · Accepted Answer

The induced current in the loop reverses direction twice in one revolution. This happens because as the loop rotates through the magnetic field, the sides of the loop that cut through the magnetic field lines change direction relative to the field. This change in direction relative to the magnetic field occurs twice per revolution, leading to two reversals in the direction of the induced current.

A Loop of Wire Is Rotated About a Diameter (Which