Question

The adjoining diagram shows three soap bubbles A, B and C prepared by blowing the capillary tube fitted with stop cocks, S₁, S₂ and S₃. With stop cock S closed and stop cocks S₁, S₂ and S₃ opened

• A. B will start collapsing with volumes of A and C Increasing
• B. C will start collapsing with volumes of A and B increasing
• C. C and A both will start collapsing with the volume of B increasing
• D. Volumes of A, B and C will become equal at equilibrium

Answer 1

Answer: (C)

C and A both will start collapsing with the volume of B increasing

Answer 2

Excess pressure inside soap bubble is inversely proportional to the radius of bubble i.e. $\Delta P \propto \frac { 1 } { r }$

This means that bubbles A and C posses greater pressure inside it than B. So the air will move from A and C towards B.