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Two thin uniform rings made of same mate...

Two thin uniform rings made of same material and of radii `R` and `4 R` are joined as shown. The mass of smaller ring is `m`. Find the `M.I.` about an axis passing through the center of mass of system of rings and perpendicular to the plane.

A

`85 mR^2`

B

`90 mR^2`

C

`70 mR^2`

D

`35 mR^2`

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The correct Answer is:
B
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