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

Options

A. air flows from the bigger bubble to the smaller bubble till the sizes become equal
B. there is no flow of air
C. air flows from the smaller bubble to the bigger bubble
D. air flows from bigger bubble to the smaller bubble till the sizes are interchanged

Answer

C

Explanation

Excess pressure for soap bubble is `P_(i)-P_(o)=(4T)/r`
`rArr` Excess pressure `prop1/r`
Air goes from higher pressure to lower pressure
`therefore` air flows from smaller bubble to bigger bubble. Thus correct choice is (c).