Observe the figure. A and B are two places on the surface of earth. C represents the centre of the earth.
(a) In which place among A and B the weight of a body is maximum ?
(b) Justify your answer.
(c) What is the weight of a body when it is at C?
(a) At A (Pole)
(b) Earth is not spherical but bulged at poles so the distance of earth’* centre to the poles is less than the equator. The gravitational force between two masses is inversely proportional to the square of distance between them. So weight at poles will be maximum.
(c) Weight of the body at centre of the earth C will be zero.
