Question

# 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
Solution
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#### Wext=ΔU=Uf−Ui=Uf−0=UfWext=−3GMm2R→Wext<0

1
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