Two merucry drops

Question:

Two merucry drops (each of radius ' $r$ ') merge to form a bigger drop. The surface energy of the bigger drop, ifs $\mathrm{T}$ is the surface tension, is :

  1. $2^{5 / 3} \pi r^{2} \mathrm{~T}$

  2. $4 \pi \mathrm{r}^{2} \mathrm{~T}$

  3. $2 \pi r^{2} T$

  4. $2^{8 / 3} \pi r^{2} \mathrm{~T}$

Correct Option: , 4

Solution:

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