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Derive the expression for energy stored ...

Derive the expression for energy stored in a charged capacitor.

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Let C be the capacitance of the capacitor.
An intermediate situation ,the plate-1 and plate -2
have charges Q. and-Q. respectively .
The potential difference between plates is `V.=(Q.)/(C )1`
Work done to move a charge `deltaQ. ` from plate-2 to plate -1 is `deltaW=V.deltaQ.=((Q)/(C))deltaQ.`
The total work done in building the charge from
Q.=0 to Q =Q is W=overset(Q)underset(Q)int(Q.)/(C)dQ`
`W=(Q^(2))/(2C)`
This work done is stored as potentia energy in the capacitor:`u=(Q^(2))/(2C)`
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