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A block of mass \( m \) is on an inclined plane of angle \( \theta \). The coefficient of friction between the block and the plane is \( \mu \) and \( \tan \theta\mu \). The block is held stationary by applying a force \( P \) parallel to the plane. The direction of force pointing up the plane is taken to be positive. As \( \mathrm{P} \) is varied from
\( \mathrm{P} \) \( P_{1}=m g(\sin \theta-\mu \cos \theta) \) to \( P_{2}=m g(\sin \theta+\mu \cos \theta) \), the frictional force \( \mathrm{f} \) versus \( P \) graph will look like

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