A body of mass $\mathrm{m}$ is kept on a rough horizontal surface (coefficient of friction $=\mu$ ) A horizontal force is applied on the body, but it does not move. The resultant of normal reaction and the frictional force acting on the object is given by $\mathrm{F},$ where $\mathrm{F}$ is
NEET 2019, Medium
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$\mathrm{N}=\mathrm{mg}, \mathrm{F}=\mathrm{f}$
Resultant $=\sqrt{\mathrm{N}^{2} +\mathrm{f}^{2}} =\sqrt{(\mathrm{mg})^{2}+\mathrm{f}^{2}} \leq \mathrm{mg} \sqrt{1+\mu^{2}}$
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