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What are conductors? Conductors are the materials which possess a large number of free charge carries and also bound charge carriers. Whereas Insulators or dielectrics possess a negligibly small number of  free electrons . When a conductor is placed in an external electric field, net electric field in the interior of a conductor is zero , there is no charge in the interior of a conductor i.e. charge always resides on the outer surface of the conductor. The surface of the conductor is an equipotential surface and electric field over a charged conductor is perpendicular to the surface of the conductor at every point. Conductors Capacitance of a capacitor is the ratio of charge (Q) Capacitance(c) of a capacitor is the ratio of charge (Q) given and the potential (V) to which it is raised i.e. C=Q/V. The value of C depends on size, shape and relative position of two coatings of the capacitor. It also depends on nature of medium separating the two coatings. Capacity of a para...