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Two thin discs each of mass M and radius...

Two thin discs each of mass M and radius r metre are attached to form a rigid body as shown in figure. The rotational inertia of this body about an axis perpendicular to the plane of disc B and passing through its centre is

A

`2Mr^2`

B

`3Mr^2`

C

`4Mr^2`

D

`5Mr^2`

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The correct Answer is:
D
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