A parallel-plate capacitor has charge +Q on one plate and charge -Q on the other. The plates, each of area A, are a distance d apart and are separated by a vacuum. A single proton of charge +e, released from rest at the surface of the positively charged plate, will arrive at the other plate with kinetic energy proportional to (but not exactly equal to) eAQ d edQ B eQ2 Ad ed eAd

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.