Displacement of charges
Separation of positive and negative electricity within the uncharged objects is produced by the charged rod, which exerts a force of repulsion on the like portion of the charge and an attraction on the unlike. In (a) the negatively charged rubber rod cause the adjacent side of the uncharged object to becomes negatively charged, while the opposite side becomes negatively charged. Become the unlike charge is nearer the rod, the force at attraction will exceed that of repulsion and produce a net attraction of the uncharged object by the rod. In (b) is shown the case in which a positively electrified glass rod is used. it should be remembered that the separation of the charges described here does not alter the total amounts of positive and negative electricity in the uncharged object. No charge is gained or lost; all that occurs is a shift or negative electricity in the uncharged object. No charged is gained or lost; all that occurs is a shift of negative electricity toward one side of the objects, making that side predominantly negative and leaving the other side predominantly positive.
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