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Moment of inertia of a thin uniform rod ...

Moment of inertia of a thin uniform rod rotating about the perpendicular axis passing through its centre is I. If the same rod is bent into a ring and its moment of inertia about its diameter is I', then the ratio `I//I' `is,

A

`2/3pi^2`

B

`3/2pi^2`

C

`5/3pi^2`

D

`8/3pi^2`

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