em waves

ELECTROMAGNE

TIC INDUCTION

Electricity and Magnetism

Electricity and Magnetism are the important part of the life in many parts of the world. Your likely

to use electricity every day, without even thinking about it. When you switch on a television, ring a

doorbell or travel in a car, Electricity and Magnetism are involved.

Electricity dominates many parts of the world. Life without electricity

would be almost unrecognizable to many of us.

OERSTED

JOSEPH HENRY MICHAEL FARADAY

What is electromagnetic

induction?

The phenomenon of producing an emf in a

conductor as a result of change in the

magnetic flux linked with the conductor is

electromagnetic induction. The emf so

developed is called is called induced emf.

The emf is induced between the ends of

the conductor . If the conductor forms a

closed circuit . The current is called

induced current.

Experiment

A loop of wire or coil is connected to a galvanometer . A

magnet is moved in to a or withdrawn from the loop . The

following phenomena observed

IMPORTANT POINTS TO BE NOTED…………

When a magnet is introduced in the coil , the

galvanometer shows a deflection in one direction

When the magnet is withdrawn , the deflection is

reversed

When the magnet is moved faster , the deflection is

found to be greater.

When the magnet is kept stationary outside or inside the

coil, no deflection is observed.

Faraday's laws of electromagnetic induction:

1.Whenever the magnetic flux linked with a circuit changes, an EMF is induced

in the circuit, which lasts as long as the change in magnetic flux associated with

the circuit continues.

2.The magnitude of the induced EMF is equal to the rate at which the magnetic

flux linked with the circuit changes.

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