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## Homework Statement

## Homework Equations

V=Ed

Q = CV

W = 1/2 QV

## The Attempt at a Solution

Hi. My instructor gave me this problem as a homework. Actually he didnt teach us this subject. So what should i know to solve this question or from where can i study to this subject? Of course it would be great if someone solve the problem but i dont want to take your time, just need the info of this subject to learn the subject and solve the problem. Thanks..