- The Q factor of a resonant ac circuit (Section 21–15) can be defined as the ratio of the voltage across the capacitor (or inductor) to the voltage across the resistor, at resonance. The larger the Q factor, the sharper the resonance curve will be and the sharper the tuning. (a) Show that the Q factor is given by the equation Q = (1/R)VL/C. (b) At a reso- nant frequency fo = 1.0 MHz, what must be the values of L and R to produce a Q factor of 650? Assume that C = 0.010 µF. %3D

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