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A small mass m is moved slowly from the ...

A small mass m is moved slowly from the surface of the earth to a height h above the surface. The work done ( by an external agent) in doing this is

A

mgh, for all values of h

B

mgh, for `h lt lt R`

C

`(1)/(2)mgR` for h = R

D

`-(1)/(2)mgR`, for h = R

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The correct Answer is:
B, C
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