Faraday's law of Electromagnetic Induction states that:
"The Magnitude of the induced e.m.f is directly proportional to the rate of change of magnetic flux experienced by the conductor".
When a bar magnetic moves in a solenoid (coiled wires),there is a change in the magnetic flux linkage through the coil. An induced e.m.f is produced in the coil. The magnitude of the e.m.f increases when:
-the relative motion between the magnet and the coil is increased.
-the number of turns on the coil is increased.
-the cross sectional area of the coil is increased.
The direction of the induced current can be determined by using the Lenz's Law.
Lenz's law states dat an induced e.m.f always gives rise to a current whose magnetic field opposes the original change in the magnetic flux
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