Which of the following cannot be charged easily by friction?

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A plastic scale

A copper rod

An inflated balloon

A woollen cloth

answer is B.

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Detailed Solution

A copper rod cannot be charged easily by friction.
In the process of charging by friction, when one body is rubbed with another body, then the free electrons jump from one body to another, and the bodies get charged. The charge on one body is positive, and the charge on the other is negative. The process of charging depends on the conductivity of the material. Non- conducting material can be charged easily by friction. For example, a copper rod is a conductor which cannot be charged easily by friction.

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