Q 1109223118.     A soap bubble is being blown at the end of very narrow tube of radius b. Air (density ρ) moves with a velocity v inside the tube and comes to rest inside the bubble. The surface tension of the soap solution is T. After sometime the bubble, having grown to radius separates from the tube. Find the value of r. Assume that >> so, that you can consider the air to be falling normally on the bubble's surface. (2003, 4M)


A

`((1.5T)/(ρV^3))`

B

`((2T)/(ρV^4))`

C

`((4T)/(ρV^4))`

D

`((4T)/(ρV^2))`

HINT

The bubble will separate from the tube when thrust force due to striking air at B is equal to the force due to excess pressure.

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