Chapter 23, Problem 1CQ

How do the multiple-loop coils and iron ring in the version of Faraday's apparatus shown in Figure 23.3 enhance the observation of induced emf?

To determine

The reason of Multiple −loop coils and iron ring in the version of Faraday's apparatus enhance the observation of induced emf.

Answer to Problem 1CQ

The changing magnetic field an emf is induced and due to this induced emf a current is observed in the coil at the lower end of the ring.

Explanation of Solution

Introduction:

The apparatus used by Faraday to demonstrate that magnetic fields can create currents is as below: -

Coil produce the magnetic field when the switch is closed, the magnetic field produced in the coil is on the upper section of the ring and transfer to the lower part of the ring made up of iron.

The coil present at the upper part is provided with a source of emf and a switch, to achieve the complete circuit it is seen that when we close the switch or open the switch, the rotated coil which is present at the bottom of the ring made up of iron gives a deflection which is observed as the galvanometer reading.

The reading obtained in the galvanometer is the change in magnetic field that is due to the

The emf is produced because of the change in magnetic field which leads to the current flowing in the conductor coil.

Conclusion:

So, due to the changing magnetic field an emf is induced and due to this induced emf a current is observed in the coil at the lower end of the ring.