In the figure,the inner loop carries a clockwise current I that is increasing.The resistor R is in the outer loop and both loops are in the same plane.The induced current through the resistor R is
A) from a to b.
B) from b to a.
C) There is no induced current through the resistor.

Question

In the figure,the inner loop carries a clockwise current I that is increasing.The resistor R is in the outer loop and both loops are in the same plane.The induced current through the resistor R is 
A) from a to b. 
B) from b to a. 
C) There is no induced current through the resistor.

Quizplus · Accepted Answer

According to Lenz's law, the direction of the induced current will be such that it opposes the change in magnetic flux through the circuit. As the current in the inner loop is increasing in a clockwise direction, it will produce a magnetic field pointing out of the plane of the loop. This changing magnetic field will induce an emf in the outer loop and the direction of the induced current will be such that it produces a magnetic field in the opposite direction to counteract the change. Hence, the induced current will flow from a to b through the resistor R.

In the Figure,the Inner Loop Carries a Clockwise Current I