Q. If two soap bubble of different radii are connected by a tube
A) Air flows from the bigger bubble to the smaller bubble till the sizes become equal
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
Explanation
(c) The excess pressure inside the soap bubble is inversely proportional to radius of soap bubble $ie,\ p \propto 1/r,r$ being radius of soap bubble. If follows that pressure inside a smaller bubble is greater than that inside a bigger bubble. Thus, if these two bubbles are connected by a tube, air will flow from smaller bubble grows at the expense of the smaller one.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.