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A mass m is at a distance a from centre ...

A mass `m` is at a distance a from centre of a uniform rod of length `l` and M. The gravitational force on the mass due to the rod is

A

`(GMm)/(l(a+l))`

B

`(GMm)/(a(l+a))`

C

`(GMm)/(al)`

D

`(GMm)/((l//2+a))`

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