Consider a person wearing rubber shoes sliding his foot against a woolen carpet.
When the person touches a metallic door handle, he gets a shock due to the discharge of charges accumulated on the shoes. First, the rubber shoes develop a negative charge. So how does the person get the shock if the electrons are moving out of his body and not come into it?
Also if charge on the shoe is supposed to be static due to the fact that rubber is an insulator, then how does it move from the shoes to the door handle. Is it due the fact that our body is a conductor? If so, how do the electrons know that there is a path available for them to flow through i.e. the metallic handle.Next consider, if a positively charge glass rod was brought close to the shoes before the handle was touched. Would the negative charges be attracted to the rod or remain static?