G1: We have two parallel metal plates each with size 6 cm by 9 cm. The plates are separated by 0.4 millimeter with air between the plates. (a) What is the capacitance of these plates? (b) If this capacitor stores 0.62 nanoCoulombs of charge, find the size of the electric field between the plates. (c) If instead this capacitor was filled with paper instead of air with the same plate separation, what would the capacitance be?