Consider the situation shown in fig. The wall is smooth but the surface of A and B in contact are rough The friction on B due to A in equilibrium-

is upward

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is downward

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is zero

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the system cannot remain in equilibrium

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Solution

The correct option is D the system cannot remain in equilibrium
when friction force acting on the block A is upward than equal and opposite force acting on the block B than block has two force downward (mg+f)so its move downward than system is not in equilibrium
Hence system is not in equilibrium in any case Hence the correct option is D

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Similar questions

Find the friction on B due to A when:-

(i) The wall is smooth but the surfaces of A and B in contact are rough and the system is in equilibrium

(ii) All the surfaces are rough

(p) upward

(q) downwards

(r) zero

(s) system cannot remain in equilibrium

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