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The weight of an object at the centre of the earth of radius R is

 (a) zero

 (b) infinite

 (c) R times the weight at the surface of the earth

(d) \frac{1}{R^{2}} times the weight at surface of the earth

Answers (1)

A

Sol.

When we go towards the centre of earth from the surface, the acceleration due to gravity decreases.

Hence, the weight of any object decreases as we go towards the centre.

This decrease will be linear, and the weight of the body becomes zero at the centre of earth.

At the centre of earth, there will be no gravitational force.

Hence, the correct answer to this question is option A.

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