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Question

Consider a system of two blocks A,B and the wall. The wall is smooth but the surface of A and B in contact are rough. If force F is exerted on B as shown, Then:

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A
the friction on B due to A in equilibrium is upwards
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B
the friction on B due to A in equilibrium is downwards
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C
the friction on B due to A is zero
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D
the system cannot remain in equilibrium
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Solution

The correct option is D the system cannot remain in equilibrium
Here, as the wall is smooth , so, because of smooth surface of wall the system can't remain in equilibrium. Also, both the blocks will feel acceleration due to gravity downwards.
so, D is correct.

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