Some drops each of radius rcoalesce to f...

Some drops each of radius `r`coalesce to form a large drop of radius `R`. The surface tension T. Find the change in surface energy per unit volume?

`T(1/r-1/R)`

`3T(1/r-1/R)`

`3T(1/R-1/r)`

`T(1/R-1/r)`

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