If two soap bubbles of different radii are connected by a tube (a) air flows from the smaller bubble to the bigger (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.

Answer: (a). Excess pressure in a bubble = 4T/R, so the smaller bubble has the higher pressure. Air flows from higher to lower pressure: from the smaller bubble to the bigger one. The small bubble keeps shrinking (its pressure keeps rising), so the flow continues. So the answer is (a) air flows from the smaller bubble to the bigger.

If two soap bubbles of different radii are connected by a tube | JEE Main 2004 (AIEEE)

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Excess Pressure: Drops & Bubbles

If two soap bubbles of different radii are connected by a tube

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Answer: (a)

Excess pressure in a bubble $= \frac{4T}{R}$ , so the smaller bubble has the higher pressure.
Air flows from higher to lower pressure: from the smaller bubble to the bigger one.
The small bubble keeps shrinking (its pressure keeps rising), so the flow continues.
So the answer is (a) air flows from the smaller bubble to the bigger.

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