Two soap bubbles of radii $r_{1}$ and $r_{2} (r_{a} > r_{2})$ are connected by a tube. Then.

Air flows from the bubble of radius

r_{1}

to the bubble of radius

r_{2}

till their size become equal

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Air flows from the bubble of radius

r_{1}

to the bubble of radius

r_{2}

till their sizes are interchanged

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Air flows from smaller bubble to the bigger

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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
$p + \frac{4 S}{R}$
when, $S =$ surface tension, $R =$ radius of bubble
$∴ p \propto \frac{1}{R}$
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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Similar questions

Q. If two soap bubbles of different radii are connected by a tube,
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(b) air flows from bigger bubble to the smaller bubble till the sizes are interchanged
(c) air flows from the smaller bubble to the bigger
(d) there is no flow of air.

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

Two soap bubbles of radii $r_{1}$ and $r_{2} (r_{a} > r_{2})$ are connected by a tube. Then.