What is Faraday's Law?
Faraday's Law states that the magnitude of the induced electromotive force (emf) is directly proportional to the rate of change of magnetic flux.
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What is the formula linking induced emf (ϵ), change in flux (ΔΦ ), time taken (Δt) and the number of turns on a coil (N) for Faraday's Law?
ϵ = induced e.m.f. (V)
N = number of turns on coil
ΔΦ = change in magnetic flux (wb)
Δt = time taken (s)
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What is the relationship between the magnitude of induced emf and the rate of change of magnetic flux?
According to Faraday's Law, the magnitude of the induced e.m.f. is directly proportional to the rate of change of magnetic flux.
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How can you increase the induced emf in a coil?
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What happens to the induced emf if the coil has more turns?
If the coil has more turns, the induced e.m.f. will be greater.
This is because each additional turn of wire cuts more lines of magnetic flux.
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What is the effect of the coil's area on the induced emf?
Increasing the coil's area increases the amount of magnetic flux it cuts, which in turn increases the induced e.m.f.
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What is the effect of the coil's orientation on the induced emf?
When the coil is perpendicular to the magnetic field, it cuts the maximum amount of flux and results in the maximum induced e.m.f.
When the coil is parallel to the magnetic field, the induced e.m.f. is zero.
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