Two smooth blocks are placed at a smooth corner as shown. Both the blocks are having mass m. We apply a force F on the small block m. Block A presses the block B in the normal direction, due to which pressing force on vertical wall will increase, and presing force on the horizontal wall decreases. as we increase F. ( `theta = 37^@` with horizontal). As soon as the pressing force on the horizontal wall by block B becomes zero, it will loose the contact with the ground. If the value of F is further increased, the block B will accelerate in upward direction and simultaneously the block A will move toward right.

What is the minimum value of F, to lift block B from ground:

Options

A. `(25)/(12)mg`
B. `(5)/(4)mg`
C. `(3)/(4)mg`
D. `(4)/(3)mg`

Answer

C