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The figure an L shaped body of mass M pl...

The figure an `L` shaped body of mass `M` placed on smooth horizontal surface. The block `A` is connected to the body by means of an inexiensible string , which is passing over a smooth pulley of negligible mass.Another block `B` of mass `m` is placed against a vertical wall of the body. Find the minimum value of the mass of block `A` so that `B` remain stationary relative to the wall. Coefficient of friction between the block `B` and the vertical wall is `mu`.

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