4. The Parallel-Plate Capacitor with Fixed Potential Two large flat metal plates are separated by a distance d. The plates are connected to a battery as shown below. The surface area of the face of each plate is A1. V. Area A, -d a. Write an expression for the capacitance in terms of Aj and d. Explain how you found it. b. A new capacitor is formed by attaching two uncharged metal plates, each with area A2, to the capacitor as shown. The battery remains connected. Area A, Area A