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 Faraday's law of electromagnetic induction, an electric current will be induced in the approaching loop due to the changing magnetic field of the first loop. Since the current in the first loop is counter-clockwise, the induced current in the approaching loop will be in a direction that produces a magnetic field that opposes the change in the magnetic field of the first loop. This means that the induced current in the approaching loop will also be counter-clockwise. However, approaching means the second loop is moving towards the first loop. By the right-hand rule, the direction of the induced current will be such that the magnetic field produced by it will oppose the increasing magnetic field of the first loop. This means that the induced current in the approaching loop will flow in a clockwise direction as viewed by the person on the right.

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