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Let the moment of inertia of a hollow cylinder of length 30
cm (inner radius 10 cm and outer radius 20 cm) about its axis
be I. The radius of a thin cylinder of the same mass such that
its moment of inertia about its axis is also I, is
(a) 16 cm
(2019 Main, 12 Jan I)
(d) 18 cm
(c) 12 cm
(b) 14 cm

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