A parallel plate capacitor is connected to a battery of potential V. The formula

Question

A parallel plate capacitor is connected to a battery of potential V. The formula for capacitance of a parallel plate capacitor is If we change the distance between the capacitor plates, the capacitance will change. The energy stored in the capacitor can be expressed in three ways: If the plate separation is increased, the first expression suggests the energy stored decreases, whereas the second expression suggests the energy stored increases. Write a 1/2-1 page essay explaining and resolving this apparent conflict.

Explanation / Answer

if the parallel plate capacitor is connected to source ,then voltage across it is constant. Then we use 1st expression . i.e energy stored dicreases.

if the parallel plate capacitor is not connected to source ,then charge of it is constant. Then we use 2nd expression . i.e energy stored increases.

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