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3. a. Find the equivalent capacitance of the combination of series and parallel capacitors shown below. (4) 5 UF 2.5 /F 10 UF b. Draw a circuit diagram with this combination in series with an 880 kf resistor and a 115 V dc power supply and an open switch. (4) c. Calculate the time constant of the circuit. (4) d. At what time after the switch is closed is the voltage across the capacitor plates half that of the power source? (4) e. Calculate the current through the resistor 2 s after the switch is closed. (4)