A small ring of mass m is constrained to...

A small ring of mass m is constrained to slide along a horizontal wire fixed between two rigid supprots. The ring is connected to a particle of same mass by an ideal string & the whole system is released from rest as shown in the figure. If the coefficient of friction between ring A and wire is `(3)/(5)`, the ring will start sliding when the connecting string will make an angle `theta` with thev vertical, then `theta` will be (particle is free to move and ring can slide only)

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