em waves
TRANSCRIPT
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magnet is moved in to a or withdrawn from the loop .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When the magnet is withdrawn , the deflection is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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