A frictionless wire $AB$ is fixed on a circle of radius $R$. A very small bead slips on this wire. Time taken by bead to slip from $A$ to $B$ is
A frictionless wire $AB$ is fixed on a circle of radius $R$. A very small bead slips on this wire. Time taken by bead to slip from $A$ to $B$ is
- A
$\frac{{2\sqrt {gR} }}{{g\,\cos \,\theta }}$
- B
$2\sqrt {gR} \left( {\frac{{\cos\, \theta }}{g}} \right)$
- C
$2\sqrt {\frac{R}{g}} $
- D
$\frac{{gR}}{{\sqrt {g\,\cos\, \theta } }}$
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