Which of the following cannot be charged by friction, if held by hand? (a) a plastic scale (b) a copper rod (c) an inflated balloon (d) a woolen cloth. Why?

Asked by Topperlearning User | 11th Jun, 2014, 07:35: PM

Expert Answer:

Copper rod

Except copper, the other three are insulators whereas copper is a conducting object. As soon as it gets charged by rubbing with another material, the electric charge produced on its surface flow through our hand and body into the earth and it remains uncharged.

Answered by  | 11th Jun, 2014, 09:35: PM