In the circuit in Fig. Q1b, the source voltage, Vs is a 1 kHz square wave alternating between 12 V and -12 V. R. = 20 Ohm, R = 1XX Ohm and C = 1 uF. Draw appropriately labelled waveforms of the source voltage and the voltage across the capacitor. Develop a time varying expression for the transient voltage across the capacitor after each rising and falling edges of the square wave. Assume that the initial capacitor voltage is zero. (4 marks) Note: Use the last two digits of your student ID to replace the value of XX. For example, if the last two digits of your student ID is 99, then 1XX = 199. WRITE THE VALUES CHOSEN CLEARLY ON YOUR ANSWER SCRIPT. Fig. Qlb 2092 7