2. A student is provided with four object:
option
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.

Regards