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23.

The moment of inertia of a rod of length l about an axis passing through its centre of mass and perpendicular to rod is I. The moment of inertia of hexagonal shape formed by six such rods, about an axis passing through its centre of mass and perpendicular to its plane will be

(a)   16I

(b)  40I

(c)   60I

(d)  80I

Ans. c

(6)

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