A parallel-plate capacitor is made up of two rectangular plates each of length L = 10 cm and width W= 6 cm. The capacitance of the capacitor is C= 8 x 10-3 F. The capacitor is filled with air of permittivity & 8.85 x 10-2 C/N.m. (a) Find the distance d between the two plates. (b) If the capacitor is connected to a 150-V battery, find the charge Q on this capacitor. (c) Find the energy stored in this capacitor. (U= ?)