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 or A body starts sliding down at an angle \[\theta \] to horizontal. Then coefficient of friction is equal to [CBSE PMT 1993]

• A.                         \[\sin \theta \]              
• B.                         \[\cos \theta \]            
• C.                         \[\tan \theta \]            
• D.                         Independent of \[\theta \]