A block of mass m is placed on a rough horizontal surface. The coefficient of friction between them is µ. An external horizontal force is applied to the block and its magnitude is gradually increased. The force exerted by the block on the surface is R (Block does not move)-
A
The magnitude of R will gradually increase
B
R 
mg 
mg
C
The angle made by R with the vertical will gradually increase
D
The angle made by R with the vertical 
tan –1 µ
tan –1 µ
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, b, c, d)
R = 
, f ≤ μ mg
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