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Which is the correct formula for frequency in an ac generator?

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Which is the correct formula for frequency in an ac generator?

(a) f=p*n

(b) f=p/n

(c) f=n/p

(d) f=n^2p

The question was asked in an international level competition.

I need to ask this question from Relationship between Frequency, Speed and Number of Pole Pairs topic in chapter Alternating Voltage and Current of Basic Electrical Engineering

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Correct answer is (a) f=p*n

The explanation: The frequency in an ac generator is p*n, where p is pairs of poles and speed is n revolutions per second.

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