Properties Of Solids And Liquids Question 313
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 [CPMT 1988]
Options:
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
Show Answer
Answer:
Correct Answer: C
Solution:
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.
