question_answer

An ebonite rod held in hand can be charged by rubbing with flannel but a copper rod cannot be charged like this. Why?      

Answer:

                Ebonite rod is insulating. Whatever charge appears on it due to rubbing, stays on it. Copper is good conductor. Any charge developed on it flows to the earth through our body. So copper rod cannot be charged like this. It can be charged by providing it a plastic or rubber handle.