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Question

A bubble having surface tension T and radius R is formed on a ring of radius b(b<<R). Air is blown Inside the tube with velocity v as shown. The air molecule collides perpendicularly with the wall of the bubble and stops. The radius at which the bubble separates from the ring is:
939447_5af5791ca6d44b1cbbb1dc8e7c96ea16.png

A
2Tρv2
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B
2Tρv
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C
4Tρv2
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D
4Tρv
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Solution

The correct option is D 4Tρv2
Excess pressure inside a bubble = 4TR
Let area of bubble at wall where air strikes be A.
Force due to excess pressure = 4TAR
Let ρ = density of air, Force due to striking air = ρAv2
For bubble to separate from the ring.

ρAv2=4TAR or ρAv2R=4TAorR=4Tρv2

1079836_939447_ans_53fd40f4bec54f65b5bbaa085325d537.png

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