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9. A series RLC circuit with an AC voltage source is shown. The amplitude of the cur- rent, I, in this circuit is given by: where ?,-2T/d in which fa is the driving frequency; R and Care the resistance of the resistor and capacitance of the capacitor, respectively; and vm is the ampli- tude of For the circuit in the figure R-80? Cs|8x10-6F, L-260 x 10 H, and v-10V Determine fa for which 1 0.1A. (There are two solutions.)