Gujarat BoardEnglish MediumSTD 11 SciencePhysicsMechanical Properties of Fluids1 Mark
Question
When two soap bubbles stay in contact, what is the radius of the interface?
✓
Answer
If $\text{r}_1$ and $\text{r}_2$ are the radii of the soap bubbles, the net excess pressure at the interface is,$\frac{4\sigma}{\text{r}_{\text{eq}}}=\frac{4\sigma}{\text{r}_1}-\frac{4\sigma}{\text{r}_2}$
$\therefore\frac{1}{\text{r}_\text{eq}}=\frac{1}{\text{r}_1}-\frac{1}{\text{r}_2}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.