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

`2^((5)/(3))pir^(2)T`

`4pir^(2)T`

`2pir^(2)T`

`2^((8)/(3))pir^(2)T`

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