The time rate of loss of heat by a body is proportional to the

A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has

Electrical appliances in homes are normally earthed so that

The process whereby a liquid turns spontaneously into vapour is called

The differences observed in solids, liquids and gases may be accounted for by