The excess pressure across a soap bubble of radius r is p = 4σ/r, where σ is the surface…
Physics · JEE Main · NTA Exams — Properties of Solids and Liquids
The excess pressure across a soap bubble of radius r is p = 4σ/r, where σ is the surface tension of soap solution. What is the excess pressure across an air bubble of the same radius r formed inside a container of soap solution?
- \(\frac{\sigma}{\mathrm{r}}\)
- \(\frac{2 \sigma}{\mathrm{r}}\)
- \(\frac{4 \sigma}{\mathrm{r}}\)
- none of these
Answer
(B) 2 r
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