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Four spheres each of diameter 2a and mas...

Four spheres each of diameter 2a and mass M are placed with their centres at the four corners of a square of side b. Then the moment of inertia of the system about an axis along one of the sides of the square is

A

`4/5 Ma^2 + 2 Mb^2`

B

`8/5 Ma^2+2Mb^2`

C

`8/5 Ma^2`

D

`4/5 Ma^2 + 4 Mb^2`

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