1.0 Introduction

Practically it is impossible to hold a free point charge at a desired position. A practical way to handle a charge would be to put it on a conductor. Thus, one use of conductor is to store electric charge. When we store a point charge it would generate an electric field and electric potential energy will store in this electric field. But every conductor has its maximum limit of storing the electric charge or potential energy. Beyond that limit dielectric (or insulator) in which the conductor is placed becomes ionized. A capacitor is a device which can store more electric charge or potential energy compared to an isolated conductor.