Question

What is the essential thing in electromagnetic induction?

detailed please

Answer 1

Electromagnetic Induction

An electromotive force (EMF) occurs in an electric conductor that is in a changing magnetic field, i.e. it is either (1) in motion relative to a magnet or (2) in a changing magnetic field produced by a changing electric current i.e. changing magnetic flux. The induction of EMF by the motion of a conductor across a magnetic field or by a change in magnetic flux in a magnetic field is called ‘Electromagnetic Induction’.

Faraday’s law of electromagnetic induction (referred to as Faraday’s law) is a basic law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an EMF via electromagnetic induction.

Faraday’s First Law: An MF induces when a conductor is placed in a varying magnetic field, and if the conductor is a closed circuit than the induced current flows through it.

Faraday’s Second Law: The magnitude of emf induced in the coil is equal to the rate of change of magnetic flux linked with the coil.

Faraday laws can not determine the direction of induced emf i.e. the direction of the flow of induced current.

Lenz’s law: The direction of this induced current will be such that the magnetic field created by the induced current opposes the initial changing magnetic field which produced it. The direction of this current flow can be determined using Fleming’s right-hand rule.

But according to Faraday’s law of electromagnetic induction and also considering Lenz’s Law., the rate of change of flux linkage is equal to induced emf. (N is the number of turns in the coil)

Some Applications of Electromagnetic Induction

1. Eddy currents
2. Electromagnetic induction in AC generator
3. Electrical Transformers
4. Magnetic Flow Meter