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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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