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, when a conductor (the second loop) is moved through a magnetic field (created by the current in the first loop), a current is induced in the conductor. The direction of the induced current is given by Lenz's law, which states that the induced current flows in a direction such that its magnetic field opposes the change in the magnetic field that produced it. In this case, as the second loop approaches the first loop, the magnetic field due to the current in the first loop increases in magnitude. To oppose this increase in magnetic field, the induced current in the second loop will flow in a direction such that its own magnetic field opposes the magnetic field of the first loop. This means the induced current will create a magnetic field in a direction opposite to that of the first loop, which is clockwise when viewed by a person on the right. Therefore, the correct answer is A) clockwise.

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