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A capacitor is an electrical component that stores and releases electrical energy by storing and displacing electric charge. It consists of two conducting plates separated by an insulating material known as a dielectric. When an electric potential difference (voltage) is applied across the plates, the plates will store equal and opposite charges. The stored energy in a capacitor can be utilized later in various applications, such as power supplies and signal filtering.

Conductive materials like metals allow the movement of electrons, which is essential for storing electric charge in a capacitor. When a voltage is applied to the capacitor, electrons move from one plate to the other, creating a net charge separation and building up an electric field across the insulator between the plates. This electric field represents the stored energy in the capacitor. The ability of a capacitor to store charge, also known as capacitance, depends on the surface area of the conducting plates, the distance between the plates, and the properties of the insulating material between them.

If the plates of a capacitor were made of insulating materials instead of conducting materials, the capacitor would not function properly. Insulating materials do not allow free movement of electrons, so it would be nearly impossible for the capacitor to store or displace electric charge. Consequently, no electric field would form between the plates, and the capacitor would not store any energy. In conclusion, a capacitor's plates must be made of conducting material to allow the storage of electric charge and displacement when a voltage is applied across the plates. Using two insulating plates would render the capacitor incapable of storing and releasing electrical energy due to the lack of charge movement and electric field formation between the plates.