Physics - Fluid Question with Solution | TestHub

The correct option is (C). There are two free surfaces as shown in the figure:Consider the force balance per unit length as shown in the diagram above: $2\mathrm{T}=\mathrm{e}\pi {\mathrm{r}}^2\mathrm{g}$ Therefore, $r=\sqrt{\frac{2\mathrm{T}}{\pi \mathrm{eg}}}$. We neglect buoyancy force as it is negligible as compared to surface tension force!