A block of mass m lying on a rough horiz...

A block of mass m lying on a rough horizontal plane is acted upon by a horizontal force P and another force Q inclined at an angle `theta` to the vertical. The minimum value of coefficient of friction of friction between the block and the surface for which the block will remain in equilibrium is

`( P+ Q sin theta)/( mg + Q cos theta ) `

`( P cos theta + Q)/( mg - Q sin theta ) `

` ( P + Q cos theta )/( mg + Q sin theta ) `

` ( P sintheta - Q)/( mg - Q cos theta ) `

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