A friction wire AB is fixed on a sphere ...

A friction wire AB is fixed on a sphere of radius R. A very small spherical ball slips on this wire. The time taken by the ball to slip from A to B.

`(sqrt2gR)/(gcos theta)`

`2sqrt(gR). (cos theta)/(g)`

`2sqrt((R)/(g))`

`(gR)/(sqrt(gcos theta))`

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