A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is
  • A$\frac{3}{4}$
  • B$\frac{1}{4}$
  • C$\frac{2}{3}$
  • D$\frac{1}{2}$
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