if potential at the surface of earth is assigmed zero value,then potential at centre of earth will be

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Q. If potential at the surface of earth is assigned zero value, then potential at centre of earth will be (Mass = M, Radius = R):

Q. If

V

is the gravitational potential on the surface of the earth, then what will be its value at the centre of the earth?

Q. Gravitational potential on the surface of earth is V. Gravitational potential at the centre of earth is THEN :

Q. If

V

is the gravitational potential on the surface of the earth, then what is its value at the centre of the earth?
(Assume that mass distribution is uniform)

We say that gravitational potential energy is zero when the object is on the ground(earth surface). My doubt is that can gravitational potential energy be considered zero anywhere (at any altitude) when object is kept on the surface of earth? And also there is distance between the object and the centre of the earth, how can the gravitational potential energy be considered zero?

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