A) air flows from the smaller bubble to the bigger bubble
B) air flows from bigger bubble to the smaller bubble till the sizes are interchanged
C) air flows from the bigger bubble to the smaller bubble till the sizes become equal
D) there is no flow of air.
Correct Answer: A
Solution :
[a] Let pressure outside be \[{{P}_{0}}\] \[\therefore \]\[{{P}_{1}}\] (in smaller bubble )\[={{P}_{0}}+\frac{2T}{r}\] \[{{P}_{2}}\] (in bigger bubble)\[={{P}_{0}}+\frac{2T}{R}(R>r)\] \[\therefore {{P}_{1}}>{{P}_{2}}\] hence air moves from smaller bubble to bigger bubble.
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