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

Options

  1. AUpward
  2. BDownward
  3. CZero
  4. DThe system cannot remain in equilibrium

Correct answer

D. The system cannot remain in equilibrium

Step-by-step solution

Considering A and B as a system. There is no vertical force in upward direction to support their weight. Therefore, the system cannot remain in equilibrium.

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