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Question

Two soap bubbles of radii r1 and r2(ra>r2) are connected by a tube. Then.

A
Air flows from the bubble of radius r1 to the bubble of radius r2 till their size become equal
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B
Air flows from the bubble of radius r1 to the bubble of radius r2 till their sizes are interchanged
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C
Air flows from smaller bubble to the bigger
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D
There is no flow of air
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Solution

The correct option is C Air flows from smaller bubble to the bigger
Excess pressure inside a soap bubble is given by
p+4SR
when, S= surface tension, R= radius of bubble
p1R
Hence, the pressure inside the smaller bubble is more than the bigger bubble. Thus, air flows from small bubble to bigger bubble.

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