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What is the SI unit for quality factor?

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What is the SI unit for quality factor?

(a) Hz

(b) kHz

(c) MHz

(d) No unit

This question was posed to me in semester exam.

I want to ask this question from Frequency Variation in a Series RLC Circuit topic in portion Resonance in AC Circuits of Basic Electrical Engineering

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Correct option is (d) No unit

To explain I would say: We know that Quality factor is equal to the resonant frequency divided by the bandwidth. It is one frequency divided by another hence it has no unit.

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