The phenomenon of electrifying an uncharged conductor in an external electrostatic field is called electrostatic induction. It consists in separating the positive and negative charges equal amounts of which are contained in the conductor. These induced charges disappear when the conductor is removed from the electrostatic field. In any method of electrifying the conductor the electric charges are distributed over its surface and the cavities in the enclosed conductor are shielded from the external electrostatic fields.
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