The work done by an external agent to shift a point mass from infinity to the centre of the earth is W. Then choose the correct relation.

A

W=0

B

W > 0

C

W < 0

D

W≤ 0

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Solution

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Wext=ΔU=Uf−Ui=Uf−0=Uf Wext=−3GMm2R→Wext<0

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