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On heating water, bubbles being formed a...

On heating water, bubbles being formed at the bottom of the vessel detach and rise. Take the bubbles to be spheres of radius R and making a circular contact of radius r with the bottom of the vessel. If `rlt ltR` and the surface tension of water is T, value of r just before bubbles detach is: (density of water is `rho_w`)

A

`R^(2) sqrt((rho_(w)g)/(T))`

B

`R^(2)sqrt((3rho_(w)g)/(T))`

C

`R^(2) sqrt((2 rho_(w)g)/(3T))`

D

`R^(2)sqrt((rho_(w)g)/(6T))`

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