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  4. Figure shows two blocks A and B pushed against the smooth wall with the force F. The wall is smooth but the surfaces in contact of A and B are rough. Which of the following is true for the system of blocks?

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Q. Figure shows two blocks A and B pushed against the smooth wall with the force F. The wall is smooth but the surfaces in contact of A and B are rough. Which of the following is true for the system of blocks?Physics Question Image

WBJEEWBJEE 2006

Solution:

Because the wall is smooth, so whatever may bethe applied force, the system will move downdue to its own weight. Hence, the system cannotbe in equilibrium.