2. A student is provided with four object:
1 A  plastic comb 
2 A   copper  rod 
3  A    rubber balloon 
4  A    Woolen cloth

Dear Student,

Your question is not complete, So I am assuming that you are trying to ask this question,

Q. Which of the following cannot be charged easily by friction?

  1. A  plastic comb 
  2. A  copper  rod 
  3. A   rubber balloon 
  4. A   Woollen cloth

Ans. (2) A copper rod,  

Only non-conducting materials can be easily charged by friction. Copper is a highly conducting materials. Therefore, a copper rod cannot be charged easily by friction.


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