Answer :

Electromagnetic Induction is defined as the process by which a changing magnetic field in a conductor induces a current in another conductor, is known as electromagnetic Induction.



An experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases is as follows:


1. Insert a coil over a hollow tube of a cardboard. With the wire connect the ends of the coil with a galvanometer.


2. Move the north pole of the magnet towards the end B of the coil


Observation: The galvanometer shows a deflection in the needle towards right direction


3. When Galvanometer is moved away from the coil


Observation: there is deflection in the galvanometer needle towards left direction.


4. When galvanometer is kept static


Observation: there is no deflection in the galvanometer.


This proves that when the coil and the magnet are brought in contact, a current is induced in the coil.


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