Q.
A bubble having surface tension. T and radius R is formed on a ring of radius b(b<
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a
4TρV2
b
8TρV2
c
10TρV2
d
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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