Four identical rods are joined end to end to form a square. The mass of each rod is \( M \). The...

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Four identical rods are joined end to end to form a square. The mass of each rod is \( M \). The moment of inertia of the square about the median line is
(1) \( \frac{M l^{2}}{3} \)
(2) \( \frac{M l^{2}}{4} \)
(3) \( \frac{M l^{2}}{6} \)
(4) none of these
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