9. In the following examples, describe the change incharge on each rod and charging material or object in terms of the movement of electrons, K/U (a) A glass rod is rubbed with a wool rag. (b) A plastic rod is rubbed with a silk scarf. (c) A platinum rod with a negative charge is touched with a similar rod with a positive charge. (d) A small metal rod touches a large positivelycharged metal sphere.

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