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The moment of inertia of a solid cylinder about its own axis is the same as its
\( \mathrm{P} \) moment of inertia about an axis passing through its centre of gravity and
W perpendicular to its length. The relation between its length \( \mathrm{L} \) and radius \( \mathrm{R} \) is
(1) \( \mathrm{L}=\sqrt{2} \mathrm{R} \)
(2) \( \mathrm{L}=\sqrt{3} \mathrm{R} \)
(3) \( L=3 R \)
(4) \( \mathrm{L}=\mathrm{R} \)
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