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A massless ring hangs from a thread and ...

A massless ring hangs from a thread and two beads of mass `m` slide it without friction. The beads are released simultaneously from the top of the ring and slide down along possible sides. Find the angle from vertical at which the ring will start to rise.

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The correct Answer is:
A, B, C

at `alpha=cos^(-1)((2)/(3))` balls will leave contact with inner wall and came in contact with outer wall then force on ring will be `2N cos alpha` in upward direction.

So ring will start rising as it is massless .
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