Two blocks A and B are pressed against a vertical wall by applying a horizontal force 'F' as shown in the figure. There is no friction between A and B. Then
a) Both the blocks A and B can be at rest for any magnitude of F
b) B can be at rest A moves down for smaller magnitude of F
c) Both A and B will move down for smaller magnitude
d) A can be at rest and B moves down for larger magnitude of F

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a and d are correct

a and b are correct

b and c are correct

c and d are correct

answer is B.

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Detailed Solution

Since, there is no friction between body A and B, body B slides over A due to its weight. But there is a frictional force acting between A and wall, Thus, Body A avoids sliding because of friction.
Hence, both A and B will move down for smaller magnitude of F and A can be at rest and B moves down for larger magnitude of F.

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