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Question

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



A

air flows from the bigger bubble to the smaller bubble till the sizes become equal

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B

air flows from bigger bubble to the smaller bubble till the sizes are interchanged

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C

air flows from the 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 the smaller bubble to the bigger


Excess pressure is P=4TR for the bubble. The pressure inside the bubble having smaller radius will be more, thus air flows from smaller to the bigger bubble.


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