A tube of fine bore AB is connected to a...

A tube of fine bore `AB` is connected to a manometer `M` as shown. The stop cock `S` controls the flow of air. `AB` is dipped into a liquid whose surface tension is T. On opening the stop cock for a while, a bubble is formed at `B` and the mamometer liquid and r the radius of curvature of the bubble, then the surface tension `T` of the liquid is given by

`rho h rg`

`2rho hgr`

`(r h rho g)/(2)`

`(r h rho g)/(4)`

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