Consider the situation shown in the figu...

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

is upward

is downward

is zero

the system cannot remain in equilibrium for any value of F.

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The correct Answer is:

Block A cannot be in equilibrium as the contact surface with the wall is smooth. Due to its own weight, it slides down. So, friction on it must act in the upward direction

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