An object of the weight 80Kg on earth is taken to a planet where the acceleration due to gravity is one third of its value on earth. The weight of the object on that planet is

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

The principle of operation of an induction coil is based on

Which of the following factors has no effect on the e.m.f of a primary cell?