1. The problem statement, all variables and given/known data 2. Relevant equations V=Ed Q = CV W = 1/2 QV 3. 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..