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In the figure PQRS is a frictionless hor...

In the figure `PQRS` is a frictionless horizontal plane on which a particle `A` of mass `m` moves in a circle of radius `r` with an angular velocity `omega` such that `omega^(2)r=g//3` .Another particle of mass `m` is tied to `A` through an inextensible massless string. `O` is the hole through which string passes down to `B.` B can move only vertically. The tension in the string at this instant will be `:`

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