(Answered) It is often useful to define a quality factor or q-factor

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It is often useful to define a "quality factor" (or "Q-factor") for an oscillator:

Q=2Π X (Energy stored/ Energy dissipated during one period)

(a) Find an expression for the Q-factor of a series RLC circuit driven at the resonant frequency (no in terms of R, L and C.

(b) What does it mean physically if Q < 1 for a particular circuit? What would happen, for instance, if a switch were suddenly closed which completed the circuit by a wire rather than the ac supply?

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