A bubble having surface tension. T and radius R is formed on a ring of radius b(b<

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4TρV2

8TρV2

10TρV2

16TρV2

answer is A.

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Detailed Solution

The bubble will separate from the tube when thrust force exerted by the air is equal to the force due to excess pressure. F=PA ρAv2=4TRA∴ R=4Tρv2

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