Two beads connected by massless inextensible string are placed over the fixed ring as shown in figure. Mass of each bead is $m$ , and there is no friction between $B$ and ring. Find minimum value of coefficient of friction between $A$ and ring so that system remains in equilibrium. ( $C \to $center of ring, $AC$ line is vertical)

817-727

  • A

    $\frac{1}{2}$

  • B

    $\frac{1}{3}$

  • C

    $\frac{1}{4}$

  • D

    $\frac{1}{8}$

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