A block is at rest on an inclined plane making an angle $\alpha $ with the horizontal. As the angle $\alpha $ of the incline is increased, the block starts slipping when the angle of inclination becomes $\theta $. The coefficient of static friction between the block and the surface of the inclined plane is
AIPMT 1993, Easy
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(c) Coefficient of friction $=$ Tangent of angle of repose
$\therefore \mu = \tan \theta $
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