Question 182 of 210

Given in the figure are two blocks $A$ and $B$ of weight $20N$ and $100N$, respectively. These are being pressed against a wall by a force $F$ and kept in equilibrium as shown. If the coefficient of friction between the blocks is $0.1$ and between block $B$ and the wall is $0.15$, the frictional force applied by the wall on block $B$ is:

A$150N$B$100N$C$80N$D$120N$

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Answer: (D) $120N$

For complete state equilibrium of the system. The state friction on the block $B$ by the wall will balance the total weight $120N$ of the system.