A block pressed against the vertical wall is in equilibrium. The minimum coefficient of friction is:-
A$0.4$
B$0.2$
C$0.5$
D
none of these
Medium
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C$0.5$
c $\mu m g \leq m g-\frac{m g}{2}$
$\mu_{\min }=\frac{1}{2}$
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