A body is placed on an inclined plane. The coefficient of friction between the body and the \( P...

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A body is placed on an inclined plane. The coefficient of friction between the body and the
\( P \) plane is \( \mu \). The plane is gradually tilted up. If \( \theta \) is the inclination of the plane, then frictional force on
W the body is
(1) constant upto \( \theta=\tan ^{-1}(\mu) \) and decreases after that
(2) increases upto \( \theta=\tan ^{-1}(\mu) \) and decreases after that
(3) decreases upto \( \theta=\tan ^{-1}(\mu) \) and constant after that
(4) increases upto \( \theta=\tan ^{-1}(\mu) \) and constant after that
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