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Two spheres each of mass M and radius R/...

Two spheres each of mass `M` and radius `R//2` are connected at their centres with a mass less rod of length `2 R`. What will be the moment of inertia of the system about an axis passing through the centre of one of the sphere and perpendicular to the rod ?

A

`(21)/(5) Mr^(2)`

B

`(2)/(5)Mr^(2)`

C

`(5)/(2) Mr^(2)`

D

`(5)/(21) Mr^(2)`

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