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

A block of mass m lying on a rough horizontal plance is acted upon by a horizontal force P and another force Q inclined at an angle `theta` to the vertical. The block will remain in equilibrium, if the coefficient of friction between it and the surface 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 sin theta -Q))/((mg -Q cos theta))`

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