Given in the figure are two blocks $A$ and $B$ of weight $20\ N$ 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 $......... N$
JEE MAIN 2015, Medium
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Assuming both the blocks are stationary
$N=F$
$f_1=20 N$
$f_2=100+20=120 N$
Considering the two blocks as one system and due to equilibrium $f=120 N$
$N=F$
$f_1=20 N$
$f_2=100+20=120 N$
Considering the two blocks as one system and due to equilibrium $f=120 N$
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