1. Tardigrade
  2. Question
  3. Physics
  4. When two soap bubbles of radii a and b ( b > a ) coalesce, the radius of curvature of common surface is:

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. When two soap bubbles of radii $a$ and $b ( b > a )$ coalesce, the radius of curvature of common surface is:

JEE MainJEE Main 2021Mechanical Properties of Fluids

Solution:

Excess pressure at common surface is given by
$P _{ ex }=4 T \left(\frac{1}{ a }-\frac{1}{ b }\right)=\frac{4 T }{ r }$
$\therefore \frac{1}{ r }=\frac{1}{ a }-\frac{1}{ b }$
$r =\frac{ ab }{ b - a }$