A circular conducting loop lies in the $x y$ plane of a certain reference frame. We are looking down on the loop with the $+z$ axis pointing up at us.
-(b) If the magnetic field points in the $+z$ direction but is decreasing in magnitude, which way will current flow?
A) Counterclockwise
B) Clockwise
C) No current will flow.

Question

Quizplus · Accepted Answer

According to Lenz's Law, the induced current in the loop will flow in such a way as to oppose the change in magnetic flux. Since the magnetic field is decreasing in the +z direction, the induced current will flow counterclockwise to try to increase the magnetic field in the +z direction, opposing the decrease.

A Circular Conducting Loop Lies in The xyx yxy Plane of a Certain Reference Frame

A Circular Conducting Loop Lies in The $x y$ Plane of a Certain Reference Frame