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Question

Seven identical circular planar discs, each of mass M and radius R are welded
symmetrically as shown. The moment of inertia of the arrangement about the axis normal to the plane and passing through the point P is


A
732MR2
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B
1812MR2
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C
192MR2
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D
552MR2
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Solution

The correct option is B 1812MR2
Ip=I0+7M(3R)2
=(MR22+6(MR22+M(2R)2))+7M(3R)2
=1812MR2

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