A parallel-plate capacitor has plates with an area of 420 cm2 and an air-filled

Question

A parallel-plate capacitor has plates with an area of 420 cm2 and an air-filled gap between the plates that is 2.50 mm thick. The capacitor is charged by a battery to 560 V and then is disconnected from the battery. (please answer in micro J).

A.) How much energy is stored in the capacitor?

B.) The separation between the plates is now increased to 4.00 mm . How much energy is stored in the capacitor now?

C.) How much work is required to increase the separation of the plates from 2.50 mm to 4.00 mm ?

Explanation / Answer

A)energy is stored in the capacitor=1/2 X ( 420X10-4X8.85X10-12/(2.50X10-3))X5602

B)when the separation between the plates is now increased to 4.00 mm

energy stored in the capacitor now=1/2 X ( 420X10-4X8.85X10-12/(4X10-3))X5602

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