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 approaching loop) is moved through a magnetic field (created by the current in the first loop), an electric current is induced in the conductor. The direction of the induced current is such that it opposes the change in flux that is causing it. In this case, the approaching loop is moving towards the first loop, which means that the magnetic field is increasing in the region of the approaching loop. Therefore, the induced current in the approaching loop will flow in a direction such that it opposes this increase in magnetic flux. To do so, the induced current must create a magnetic field that opposes that of the first loop, which means that the induced current must 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