Actually, the word 'Induction' comes from the word induced. That means some result coming without direct contact or by induction method. So, electromagnetic induction is the induction of electric current in a coil or circuit due to the magnetic field. So, it can be said that electromagnetic induction is the process where a conductor (coil) is placed in a magnetic field which is changing. Now from Faraday’s law, it can be said that there will be a development of potential in the conductor. Now due to build up of voltage across the conductor a current flows in the circuit which is said to be induced current.
Now coming to the history of electromagnetic induction, Michael Faraday and Joseph Henry first discovered and explained the theory of electromagnetic induction in 1831. In the first practical demonstration of electromagnetic induction Faraday wrapped a ‘torus’ with wires and after sending current through the wires it was seen that there is also current flow in the ring. This practically proved the law of electromagnetic induction.
The quantitative statement of Faraday’s law can be stated as -------
The induced electromagnetic force in any closed circuit is equal to the negative of the time rate of change of the magnetic flux through the circuit.
The main advantage of the electromagnetic induction is that it physically isolates two circuits but electrically connects them. Depending on this principles many costly equipments are provided safety from accidents. Transformer also works on the principle of electromagnetic induction.
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