Answer :
An air capacitor is made by using two flat plates, each with area a, separated by a distance d, then a metal slab having thickness a (less than d) and the same shape and size as the plates is inserted between them, a capacitor has dielectric material between two plates.
A capacitor is a device that stores electrical energy in an electric field by using the buildup of electric charges on two neighboring surfaces that are electrically insulated from one another. It is a passive electrical component with two terminals. A capacitor's effect is referred to as capacitance. A capacitor is an electrical component designed to increase capacitance, even though there is some capacitance between any two neighboring electrical wires in a circuit. In its early days, the capacitor was referred to as a "condenser," and you may still see it in a few compound names, such "condenser microphone." There are several sorts of practical capacitors that are often used, and they are available in a wide range of physical shapes and constructions. The majority of capacitors include two or more electrical conductors separated by an insulating substance, typically in the form of metallic plates or surfaces. An electrolyte, thin sheet, sintered metal bead, or foil can all function as conductors. The nonconducting dielectric increases the charge capacity of the capacitor.
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