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Block A of mass M is placed on an inclin...

Block A of mass M is placed on an incline plane, connected to a string, passing over a pulley as shown in the fig. The other end of the string also carries a block B of mass M. The system is held in the position shown such that triangle APQ lies in a vertical plane with horizontal line AQ in the plane of the incline surface.

Find the minimum coefficient of friction between the incline surface and block A such that the system remains at rest after it is released. Take `theta = alpha = 45^(@)`

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