As soon as a metallic conductor is placed in an electric field, the negative charges (electrons) get displaced in the direction against the field. This displacement continues only for a small fraction of a second. Because of this displacement a certain charge distribution takes place such that the electric field at all the points inside the conductor vanishes. Thus, in the static case the electric field inside a conductor is absent ().
We can easily show that inside a conductor, field intensity must be zero. If this were not so, an ordered motion of the charges would occur in the conductor without any expense of energy from an external source. But this contradicts the law of conservation of energy. Hence, the field intensity within a conductor .
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