Question

Question = An ebonite rod held in hand can be charged by rubbing with a flannel but a copper rod cannot be charged like this, why ?

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Answer 1

Explanation:

since ebonite rod it an insulator ,it can be charged by friction .and a copper rod is instead a conductor used for making wires, the charging can not be done because electrons will flow through it.Hence,it can not be charged by rubbing,friction.

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Answer 2

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Because, both the human body and the copper rod conduct electricity. when it is attempted to charge a copper rod by rubbing, the charge flows from the rod to the earth through the hand. However, ebonite rod is charged by rubbing, the charges so produced stay on the ebonite rod, as it is bad conductor of electricity.