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Four point masses each of value \( m \) are placed
\( \mathrm{P} \) at the corners of a square \( \mathrm{ABCD} \) of side \( l \). The

W moment of inertia of this system about an axis passing through \( \mathrm{A} \) and parallel to \( \mathrm{BD} \) is :-
- (1) \( 2 m l^{2} \)
(2) \( \sqrt{3} m l^{2} \)
(3) \( 3 m l^{2} \)
(4) \( m l^{2} \)
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