JEE Main202117 Mar 2021Morning ShiftPhysicsMechanical Properties of FluidsActual
When two soap bubbles of radii a and b ( b > a ) coalesce, the radius of curvature of common surface is:
Options
- Aa b b - a
- Ba + b a b
- Cb - a a b
- Da b a + b
Correct answer
A. a b b - a
Step-by-step solution
Excess pressure at common surface is given by P e x = 4 T 1 a - 1 b = 4 T r ∴ 1 r = 1 a - 1   b r = a b b - a