The plate area of a flat air condenser is 0.01 m ^ 2, the distance between them is 2 cm. A potential difference of 3 kV is applied to the capacitor plates. What will be the field strength of the capacitor, if, without disconnecting it from the voltage source, the plates are moved apart to a distance of 4 cm. Find the energy of the capacitor before and after the plates are moved apart.

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