The parallel plates in a capacitor, with a plate area of 8.50 cm2 and an air-filled separation of 3.00 mm, are charged by a 6.00 V battery. They are then disconnected from the battery and pulled apart (without discharge) to a separation of 8.00 mm. Neglect fringing. (a) Find the potential difference between the plates. (b) Find the initial stored energy.

(A) Potential difference between plates will be 6 volt

(b) Initial energy stored will be

Explanation:

It is given area of parallel late capacitor

Initial voltage

Distance between plates d = 3 mm = 0.003 m

Capacitance

So charge on the capacitor

(a) This charge will be constant after disconnection.

After disconnection voltage will be

(b) Initial energy stored in the capacitor