A series circuit containing R, (L) and (C) is excited by a step voltage input. The voltage

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A series circuit containing R, \(L\) and \(C\) is excited by a step voltage input. The voltage across the capacitance exhibits oscillations. The damping coefficient (ratio) of this circuit is given by:
(a) \(\zeta=\frac{\mathrm{R}}{2 \sqrt{\mathrm{LC}}}\)
(b) \(\zeta=\frac{\mathrm{R}}{\mathrm{LC}}\)
(c) \(\zeta=\frac{\mathrm{R}}{2 \sqrt{\mathrm{C} / \mathrm{L}}}\)
(d) \(\zeta=\frac{\mathrm{R}}{2 \sqrt{\mathrm{L} / \mathrm{C}}}\)

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