A chain of length $L$ rests on a rough table. If $\mu $ be the coefficient of friction, the maximum friction of the chain that can hang over the table will be
A$\frac {\mu -1}{\mu }$
B$\frac {\mu }{\mu +1}$
C$(\mu -1)$
D$\frac {1}{\mu +1}$
Medium
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B$\frac {\mu }{\mu +1}$
b Let $m$ be the mass per unit length of the chain.
Suppose the length of the hanging chain is $l.$ Then,
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