Question

Two soap bubble coalesce. It is noticed that, whilst joined together, the radii of the two bubbles are a and b where a>b. Then the radius of curvature of interface between the two bubbles will be

• A. $a-b$
• B. $a+b$
• C. $\frac {ab}{(a-b)}$
• D. $\frac {ab}{(a+b)}$

Answer 1

Answer: (C)

$\frac {ab}{(a-b)}$

Answer 2

The correct option is (C): $\frac {ab}{(a-b)}$.