Answer :

Only non-conducting materials can be charged by friction


Option (a) Plastic is non-conducting material hence it can be easily charged by friction.


Option (b) Copper is conducting material hence copper rod cannot be easily charged by friction. Therefore, it is the correct option


Option (c) Balloon is non-conducting material hence it can be easily charged by friction.


Option (d) Wool is non-conducting material hence it can be easily charged by friction.


Option (e) Wood is non-conducting material hence it can be easily charged by friction.

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