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P 9.4-4 The circuit shown in Figure P 9.4-4 contains a switch that is sometimes open and sometimes closed. Determine the damping factor. x. the resonant frequency, co, and the damped resonant frequency. (4. of the circuit when (a) the switch is open and (b) the switch is closed. 80 Q 20 $2 M 40 V 100 02 M 10 mF