Four identical thin rods each of mass M and length $l$, form a square frame. Moment of inertia of this frame about an axis through the centre of the square and perpendicular to its plane is
${2 \over 3}M{l^2}$
${{13} \over 3}M{l^2}$
${1 \over 3}M{l^2}$
${4 \over 3}M{l^2}$
Solution
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