There are four point masses \( m \) each on the \( \mathrm{P} \) co...

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There are four point masses \( m \) each on the
\( \mathrm{P} \) corners of a square of side length \( l \). What is

W the moment of inertia of the system about one of its diagonals?
(1) \( 2 m l^{2} \)
(2) \( m l^{2} \)
(3) \( 4 m l^{2} \)
(4) \( 6 m l^{2} \)
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