QJEEM21Ph4f1f: JEE Main 2021 Physics - Class 11 JEEM21Ph4f1f Solution: When two soap bubbles of radii a and b (b > a) coalesce, the…

Question

Verified Solution • 2025–26 Session moderate

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

Accepted Answer

{P_1} - {P_0} = {{4S} \over b}

....(1)

{P_2} - {P_0} - {{4S} \over a}

.....(2)

{P_2} - {P_1} = {{4S} \over R}

......(3)

eq(2) - eq(1) = eq(3)

\Rightarrow

{1 \over a} - {1 \over b} = {1 \over R}

\therefore

R = {{ab} \over {b - a}}

Step-by-Step Verified Solution