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Charging by Rubbing

A negatively ...

Question

A negatively charged metal sphere is fixed to a wooden stand. What will happen if it is
(a) touched by a neutral glass rod
(b) touched by a metal rod
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Solution

(a) The metal sphere remains negatively charged as the glass rod is an insulator.

(b) The metal sphere becomes neutral, because excess electrons move from it to the metal rod.

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