A capacitor is formed from two concentric spherical conducting shells separated by vacuum. The inner sphere has radius 12.5 cm, and the outer sphere has radius 14.8 cm. A potential difference of 120 V is applied to the capacitor.
(a) What is the energy density at r = 12.6 cm, just outside the inner sphere?
(b) What is the energy density at r = 14.7 cm, just inside the outer sphere?
(c) For a parallel-plate capacitor the energy density is uniform in the region between the plates, except near the edges of the plates. Is this also true for a spherical capacitor?