A parallel-plate capacitor with a gap of 0.220 mm is filled with a dielectric with constant x = 4.80. When the capacitor's potential difference is 53.0 V, what is the energy density? 7.3 J/m^3.
b. Find the average energy density in an AA battery. A typical new alkaline AA battery stores 9.00 * 10^3 J of electrical energy and has a volume of 8.30 cm^3.