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Two mercury drops (each of radius r) mer...

Two mercury drops (each of radius r) merge to form a bigger drop. The surface energy of the bigger drop, if `T` is the surface tension is

A

`2^(5//3) pi r^(2) T`

B

`4pi r^(2) T `

C

`2 pi r^(2) T `

D

` 2 ^(8//3) pi r^(2) T `

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