Um. From what I remember of having learned about capacitors in a basic physics course a long time ago, the net charge of the capacitor is always the same. When

Um. From what I remember of having learned about capacitors in a basic physics course a long time ago, the net charge of the capacitor is always the same. When voltage is applied to a capacitor, it generates an electric field between the plates, which causes charge separation. The charge is already there, its source is the dielectric between the capacitor plates. So charging the capacitor may make one plate slightly lighter, the other slightly heavier, but its overall mass is the same. Is it this mass change he's trying to use?