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Q.

A block of mass m is at rest on an inclined plane which is making angle θ with the horizontal. The coefficient of friction between the block and plane is  μ. Then, frictional force acting between the surfaces is 

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a

mg sin θ

b

μ (mg sin θ - mg cos θ)

c

μ  mg sin θ

d

μ mg

answer is D.

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Detailed Solution

The block of mass m is at rest on an inclined plane. Hence, frictional force acting between the surfaces is

f=mgsinθ

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