A parallel-plate capacitor has fixed charges +Q and ?Q.
Chapter 23, Problem 50P(choose chapter or problem)
(II) A parallel-plate capacitor has fixed charges +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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