Given in the figure are two blocks $A$ and $B$ of weigh $20 N$ and $100 N$ respectively. These are being pressed against a wall by a force $F$ 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

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$120 N$

$80 N$

$150 N$

$100 N$

answer is B.

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Detailed Solution

Normal forces on block $A$ due to $B$ and between $B$ and wall will be $F$ . Friction on $A$ due to $B = 20 N$
$∴$ Friction on $B$ due to wall $= 100 + 20 = 120$

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