A closed,circular loop has a counter-clockwise current flowing through it as viewed by a person on the right,as shown in the figure.If a second closed circular loop with the same radius approaches this loop with constant velocity along a common axis as shown,in what direction will a current flow in the approaching loop as viewed by the person on the right?
A)clockwise
B)counter-clockwise
C)No current will be induced because the velocity of approach is constant.

Question

A closed,circular loop has a counter-clockwise current flowing through it as viewed by a person on the right,as shown in the figure.If a second closed circular loop with the same radius approaches this loop with constant velocity along a common axis as shown,in what direction will a current flow in the approaching loop as viewed by the person on the right? 
A)clockwise 
B)counter-clockwise 
C)No current will be induced because the velocity of approach is constant.

Quizplus · Accepted Answer

According to Lenz's law, any change in magnetic flux induces an EMF that opposes the change. As the second loop approaches the first loop, the magnetic flux through the second loop increases, and to oppose this increase, a current will flow in the second loop in a direction that creates a magnetic field that opposes the increasing flux. Since the magnetic field of the first loop is in the upward direction (as seen from the right), the induced current in the second loop will create a magnetic field that points downward, which is in the clockwise direction. Therefore, the answer is A) clockwise.

A Closed,circular Loop Has a Counter-Clockwise Current Flowing Through It