WHY A METAL CAN NOT BE USED AS DIELECTRIC MEDIUM IN A CONDENSER?
A capacitor consists of two conductors separated by a non-conductive region. The non-conductive region is called the dielectric. In simpler terms, the dielectric is just an electrical insulator. Examples of dielectric media are glass, air, paper, vacuum. A metal is an element, compound, or alloy that is a good conductor of both electricity and heat.