A capacitor is made with square parallel plates, each of width 2.5 mm and separated byd = 0.1 mm. The capacitor is initially uncharged, when a switch is closed at t = 0 connectingit in series to a 9 V DC emf, and a 100- resistor. a. Calculate the capacitance. b. Write an expression for the potential across the capacitor at time t. c. Calculate the displacement current between the plates immediately after t = 0. d. Calculate the displacement current between the plates at t = 166 ps (1.66 x10-10⁰ s).