Science
Which of the following cannot be charged easily by friction?
- A plastic scale
- A copper rod
- An inflated balloon
- A woollen cloth.
Static Electricity
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Answer
A copper rod.
Reason — When an object is charged by friction, charges develop on the two materials involved in friction. Copper being a good conductor, allows the charges to move easily and redistributes the excess charges quickly and doesn't retain a significant charge through friction. Therefore, it's difficult to charge a copper rod through friction.
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