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electromagnetic induction
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notes on electromagnetic induction
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Electromagnetic Induction:Definition:
• Electromagnetic induction is the process of generating an electromotive force
(emf) or voltage in a conductor when it is exposed to a changing magnetic field.
Key Principles:
• Faraday's Law of Electromagnetic Induction:
o States that the induced electromotive force (emf) in a closed loop is directly
proportional to the rate of change of magnetic flux through the loop.
o
• Lenz's Law:
o States that the direction of the induced electromotive force (emf) in a circuit
is always such that it opposes the change that produced it.
o This law ensures that energy conservation is maintained as the induced
current or emf opposes the change in the magnetic field.
Factors Affecting Induced EMF:
• Rate of Change of Magnetic Field:
o A faster change in the magnetic field induces a larger electromotive force.
• Number of Turns in the Coil:
o More turns in a coil enhance the induced emf due to a larger area for
magnetic flux linkage.
• Strength of the Magnetic Field:
o A stronger magnetic field induces a larger emf when there's a change in it.
Applications:
• Electric Generators:
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