Jan 05, 2015 · A perfect dielectric has a infinite resistance. So how does an AC ammeter register alternating current when an alternating voltage is applied to a capacitor? The answer is that when a voltage is applied between the two plates of a capacitor, a charge builds up on one plate and depletes equally on the opposite plate. A parallel-plate capacitor with one plate in the :cz plane with areal charge density Oo in its rest frame S, the other located at y = d with areal charge density is moving to the right along the It is sandwiched between two infinite sheets of charge separated by a distance d with surface charge density for the y.
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