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Flashcards on Electromagnetic Induction
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What is electromagnetic induction?
The generation of an electromotive force by a changing magnetic field.
Who discovered electromagnetic induction?
Michael Faraday
What is the principle behind electromagnetic induction?
Faraday's Law of Electromagnetic Induction
What is the formula for calculating induced electromotive force?
EMF = -N(dPhi/dt)
What are the factors that affect the magnitude of induced EMF?
Number of turns, magnetic field strength, and rate of change of magnetic field
State the direction of the induced current in a coil due to a changing magnetic field.
The direction of the induced current is determined by Lenz's Law.
What is self-induction?
Self-induction is the induction of an electromotive force in a coil by the changing current in the same coil.
What is mutual induction?
Mutual induction is the induction of an electromotive force in a coil due to the changing current in another nearby coil.
What are some applications of electromagnetic induction?
Electric generators, transformers, and induction cooktops.
How does electromagnetic induction relate to Faraday's law?
Faraday's law describes the relationship between a changing magnetic field and the induced electromotive force.
What is the direction of the induced current when a magnet is moved into a coil?
The direction of the induced current opposes the motion.
What is the direction of the induced current when a magnet is moved out of a coil?
The direction of the induced current supports the motion.
What is the role of the core material in a transformer?
The core material enhances the magnetic coupling between the primary and secondary coils.
What is the formula for calculating the induced voltage in a transformer?
Vp/Vs = Np/Ns
What is the purpose of laminating the core in transformers?
Laminating the core reduces eddy current losses.
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Test Your Knowledge
Who is credited with the discovery of electromagnetic induction?
Isaac Newton
Michael Faraday
Thomas Edison
Nikola Tesla
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What is the formula for calculating induced electromotive force?
-N(dPhi/dt)
NE^2
-E(dN/dt)
E = mc^2
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What is the direction of the induced current in a coil due to a changing magnetic field?
Always clockwise
Always counterclockwise
Determined by Lenz's Law
No direction
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What are some applications of electromagnetic induction?
Electric generators
Optical fibers
Transformers
Induction cooktops
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What is self-induction?
Induction of an EMF due to an external current
Induction of an EMF in the same coil with changing current
Induction of an EMF in nearby coils
No such phenomenon exists
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What is the role of the core material in a transformer?
Enhance magnetic coupling between coils
Conduct electricity
Reduce electromagnetic interference
Store energy
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What is the formula for calculating the induced voltage in a transformer?
Vp/Vs = (Ip/Is)^2
Vp/Vs = Np/Ns
Vp/Vs = (Np/Is)^2
Vp/Vs = (Ip/Ns)^2
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What is the purpose of laminating the core in transformers?
Reduce eddy current losses
Increase transformer efficiency
Improve power factor
Enhance magnetic flux
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What is the unit of measurement for induced electromotive force?
Volts
Watts
Volts per second
Amps
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Which law describes the relationship between a changing magnetic field and the induced electromotive force?
Faraday's Law of Electromagnetic Induction
Ohm's Law
Boyle's Law
Newton's Law of Motion
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