Please help with the following questions below on Physics. Reference: Sears, Zemansky, Young & Freeman Section 26.4 (12th edition)

Fig. 1 shows a circuit used in the investigation of the charging of a capacitor through a resistor, R1, and the discharging of the same capacitor through a second resistor, R2. When the point X is connected to Y the capacitor will charge through the resistor R1. When XY is disconnected, and Y is connected to Z the capacitor will discharge through the second resistor R2. X Z C R1 = 47kn R2 = 47kQ The charging current I is given by Ic = loe RC .. ... ... .. ... (1) Write down an expression for Ln (I) against t. [1] If a graph of Ln (Ic) against t is plotted, a straight line graph is expected, and the gradient of this line is given by [1] Hence from the graph, a value for the capacitance C of the capacitor can be obtained. The discharging current Ia, flows in the opposite direction to the charging current through the micro-ammeter and is given by: la = -loe RC . . .. ... ... (2)