# 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: