A drop of liquid of density \( \rho \) is floating half immersed in a liquid of density \( \sigma \) and surface tension \( 7.5 \times 10^{-4} \, \text{N cm}^{-1} \). The radius of drop in cm will be: \( ( g = 10 \, \text{ms}^{-2} ) \)
\( \dfrac{15}{\sqrt{(2\rho - \sigma)}} \)
\( \dfrac{15}{\sqrt{(\rho - \sigma)}} \)
\( \dfrac{3}{2\sqrt{(\rho - \sigma)}} \)
\( \dfrac{3}{20\sqrt{(2\rho - \sigma)}} \)
