Question

Which of the following cannot be charged easily by friction?

• A. A copper rod
• B. A plastic scale
• C. A woolen cloth
• D. An inflated balloon

Answer 1

The correct option is A

A copper rod

When metallic rods like copper rod are rubbed, charges do not build on their surface. Instead, they escape through the metal surface by conduction. While in the case of non-metals like rubber, woollen clothes, plastics, etc., charges build up on their surface as they don't conduct. All the items like plastic, wool, and balloon are not metals and hence get charged easily except the copper rod which being a metal conducts the charge.