Consider the system shown in figure. The wall is smooth, but the surface of blocks A and B in contact are rough. The friction on B due to A in equilibrium is

Upward

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Downward

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Zero

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The system can not remain in equilibrium

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Solution

The correct option is D The system can not remain in equilibrium
Surface between wall and A is smooth, so the system will fall with acceleration g.

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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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