Does an induction cooker work in the principle of electromagnetic induction ? If so then how?
yes.
Electromagnetic induction, which is often referred to simply as induction, signifies the production of an electric current across an electric conductor, caused by a changing magnetic field. You see, electricity and magnetism are not two disjointed things; they are two entities originating from the same underlying phenomenon – electromagnetism.
Due to this, a change in a magnetic field leads to the generation of electric current; similarly, a change in the electric field across a conductor produces a magnetic field. The latter is the working principle behind induction cooktops, which is pretty much all you need to know to understand the working of induction cooktops.
An induction cooktop looks like any other ceramic cooktop, with different zones for placing pans and pots of varying sizes. It consists of a tough, heat-resistant glass-ceramic plate on which the user places pots and pans that need to be heated. Directly underneath the plate, there is an electromagnetic coil of metal that is electronically controlled. This is the main component responsible for heating the vessels kept above the cooktop.