本题目来源于试卷: gc textbook chapter 17 Electric Potential，类别为 通用国际物理
[问答题]
A parallel-plate capacitor has fihu, ljg5wfc9 2 sqfvzv,;a9oygh: o.:xed charges 05d6 tioyfzh0/u evb9 $+Q$ and $-Q$ The separation of the plates is then doubled.
(a) By what factor does the energy stored in the electric field change?
(b) How much work must be done in doubling the plate separation from d to 2d? The area of each plate is A.
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