A parallel-plate capacitor has plates with anarea of 427 cm2 and anair-filled gap between the plates that is 2.37 mm thick. The capacitor is charged by a battery to575 V and then is disconnected from the battery.
(a) How much energy is stored in the capacitor in Joules?
(b) The separation between the plates is now increased to 9.48 mm. How much energy is stored in the capacitor now in Joules?
(c) How much work is required to increase the separation of the plates from 2.37 mm to9.48 mm in Joules?