[Catalist] Average emf induced in a coil formulae

[Elizabeth Kirby]

Esteemed Catalistians
Could someone in the realm of Yr 12 Physics clarify for me whether or not students can still use the formula Emf (av.) = 4NABf, when they are given the frequency of rotation of a coil – provided they explain that there are 4 flux changes per rotation? This formula gives the same result as Faraday’s Law if one calculates the time for a quarter turn and one uses that quarter time as the time for a flux change. The new formula Emf (max) = NAB2 pi f, does not give the same answer even when one adjusts with the V peak and V RMS formula.
Urgent help required with this please.
Kind regards
Elizabeth

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