Question

A constant current of $3A$ flows counterclockwise in the circular coil P as shown in the diagram. Find out the direction of the induced current in the coil Q on the right.

A. Clockwise
B. Counter clockwise
C. Out of the page
D. There is no induced current

Answer 1

Hint: if the current in a coil is constant, then there will be no variation in the flux. Only the change in the flux can produce an induced current in the coil. The direction of the electric current which has been induced in a conductor by a varying magnetic field will be in a way that the magnetic field developed by the induced current prevents the initial varying magnetic field. This will help you in solving out the concept behind the question.

Complete step by step answer:
As we all know, the induced emf will create a current which will prevent the variation in flux. This is because the variation in flux means a variation in energy. Even though the energy can enter or leave the system, it cannot do it instantaneously. Lenz's law is explained on the basis of this. In this question, as we can see that the current is being a constant, there will be no variation in the flux occurring. Therefore, the induced current in the coil Q will be zero.
Hence we can conclude that there is no induced current in the coil Q. it is given as option D.

Note:
In accordance with the beginning of the change, Lenz's law explains the opposition towards the induction and the slowing down of the change. When we place a coil of a wire in a varying magnetic field, a current will be induced in the coil. This current will flow as there is a production of an electric field that can force the charges around the wire. It will not be the magnetic force as the charges are not moving at first. This all determines the induced current in a coil.