2. Consider the following circuit in which a capacitor is being charged by a DC source V.. R www + + V₂ (± VC (VM An oscilloscope is used to measure the voltage te across the capacitor and the voltage-time graph is displayed below. Assume the oscilloscope has infinite impedance. Voltage() 0.5 2.5 4 Time() 10 Recall from lectures that the capacitor voltage is given by v(t)=V(1-e-/*) where 7 = RC is the time constant of the circuit. (a) From the graph of ve(t), determine the value of V.. (b) If t=7, what is the value of , as a proportion of V,? (c) Use your answer to part (ii) and the graph of v(t) to estimate the time constant T. (d) If R = 1 k, estimate the size of the capacitor C..