A parallel-plate capacitor has plate area A, plate separation x, and has a charge @ stored on its plates ( Figure 1). Figure A A + 2x X -Q -QV PartA Determine the work required to double the plate separation to 211:. assuming the charge remains constant at Q. Express your answer in terms of the variables Q, at, A, and the appropriate constants. V PartB Find the change in energy stored by the capacitor. Express your answer in terms of the variables Q, :3, A, and the appropriate constants