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A uniform chain of length $L$ changes partly from a table which is kept in equilibrium by friction. The maximum length that can withstand without slipping is $l$, then coefficient of friction between the table and the chain is
  • A$\frac{l}{L}$
  • B$\frac{l}{{L + l}}$
  • C$\frac{l}{{L - l}}$
  • D$\frac{L}{{L + l}}$
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