Signal generator‘s internal impedance is purely resistive and has an open-circuit voltage of 3.5 V. When the generator is loaded with 22 ohms of resistance, its terminal voltage drops to 2.8 V. What is the generator's output impedance (pure resistance)? 2. A voltage of 20 u(t) V, where u(t) is the unit step function, is applied to a circuit consisting of the series combination of a 100 K? resistor and a 0.01 µF Capacitor. a. What is the time constant of the series RC circuit? b. What will be the values of the voltage across the capacitor and the current through the resistor at 0.5 msec? c. At what time will the voltage across the resistor be 1.5 V? d. At what time will the voltage across the capacitor be 8 V?