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What is the correct expression of ω?

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What is the correct expression of ω?

(a) ω=2π

(b) ω=2πf

(c) ω=πf

(d) ω=2f^2

I got this question in semester exam.

I'd like to ask this question from Representation of an Alternating Quantity by a Phasor in division Alternating Voltage and Current of Basic Electrical Engineering

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The correct answer is (b) ω=2πf

The explanation: The correct expression for ω is ω=2πf where f is the frequency of the alternating voltage or current.

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