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Seven identical circular planar discs, each of mass M and
radius R are welded symmetrically as shown in the figure.
The moment of inertia of the arrangement about an axis
normal to the plane and passing through the point P is
(a)
181
2
MR² (b)
19
2
MR² (c)
P.
55
MR²
2
73
(d) MR²
2

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