If you take two oppositely charged parallel plates (one set to +Q and the other set to −Q) that are fixed some distance apart, a potential forms between the two. If the two plates are electrically joined by means of a wire, current will flow from the positive plate through the wire to the negative plate until the two plates reach equilibrium (both become neutral in charge). The amount of charge separation that accumulates on the plates is referred to as the capacitance. Devices especially designed to separate charges are called capacitors.
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