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?