Question

Explain why a glass rod can be charged by rubbing when held in hand but an iron rod cannot be charged by rubbing,if held in hand?

Answer 1

Metals have free electrons which allow the conduction of charge. Thus, they are good conductors of electricity. Hence, if you rub a metal rod there would be no accumulation of electric charge on its surface. Non-metals, however, lack free electrons and on friction accumulate charges on their surfaces.