What is Electromagnetic Induction and it's applications

 Electromagnetic Induction

When a conductor moves through a stationary magnetic field or a conductor is placed in a changing magnetic field, a voltage is developed across the conductor which in turns creates an electric current in the conductor. This process of creating current through changing magnetic field is called as electromagnetic induction and the current thus formed is called induced current. A figure showing the creation of electromagnetic induction when a wire is placed in a magnetic field is given below:

Faraday's laws of Electromagnetic Induction

These laws were formulated by an English physicist named Michael Faraday. Faraday's laws are the basic laws of electromagnetism. The working principle of most of electronic motors, transformers, generators and inductors etc is based on these laws.

Faraday's First Law

This law between gives the relationship induced current and electromotive force. This law states that when there is a change in the magnetic flux associated or linked with a closed circuit, an electromotive force is induced in that circuit.

Faraday's Second Law

This law states that the magnitude of an electromotive force induced in a coil is directly proportional to the rate of change of magnetic flux linked with that coil. The linkage of flux of coil is equal to the number of turns in the coil a and association of flux with the coil.

Where 

E = induced e.m.f, 

N = number of turns in coil and 

ϕ = Flux linkage with the coil. 

Here minus sign shows that induced emf opposes the increase in the flux.

Applications of Electromagnetic Induction

• Transformers
• Induction motors
• Electric generators
• Electromagnetic forming
• Hall Effect meters
• Current Clamp
• Induction cooking
• Magnetic flow meters
• Graphics tablet
• Induction welding
• Inductive charging
• Inductors
• A flashlight which is Powered Mechanically
• Rowland ring
• Pickups
• Transcranial magnetic stimulation
• Wireless energy transfer
• Induction Sealing