A soap bubble of radius 'r' is blown up ...

A soap bubble of radius 'r' is blown up to form a bubble of radius 2r under isothemal conditions. If `sigma` be the surface tension of soap solution , the energy spent in doing so is

`3pisigmar^2`

`6pisigmar^2`

`12pisigmar^2`

`24pisigma r^2`

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