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On heating water, bubbles being formed at the bottom of the vessel detatch and rise. Take the bubbles to be spheres of radius R and making a circular contant fo radius r with the bottom of the vessel. If r<<R and the surface tension of water is T, value of r just before bubbles detatch is : (density of water is ρw )

(A)R2ρwgT(B)R23ρwgT(C)R2ρwg3T(D)R2ρwg6T

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