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Q.

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

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a

2Mr2

b

3Mr2

c

4Mr2

d

5Mr2

answer is D.

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Detailed Solution

I = IB+IA = 12Mr2+(12Mr2+M(2r)2) = 5Mr2
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