Three massless rods are fixed to form a right angled triangular frame such that \( A B=B C=l \)....

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Three massless rods are fixed to form a right angled triangular frame such that \( A B=B C=l \). Two identical small objects of mass \( m \) are fixed at \( A \) and \( C \). The frame is hinged about \( B \) such that the frame can rotate in vertical plane about an horizontal axis without friction. Initially \( A B \) is vertical and \( B C \) is horizontal and the system is released from rest.
Tension in the rod AC when it (rod AC) becomes horizontal.
(1) \( m g \)
(2) \( \sqrt{2} m g \)
(3) \( \frac{m g}{\sqrt{2}} \)
(4) None of these
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