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+Qsintheta)/(mg+Qcostheta)`

`(Pcostheta+Q)/(mg-Qsintheta)`

`(P+Qcostheta)/(mg+Qsintheta)`

`(P sintheta-Q)/(mg-Qcostheta)`

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