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Radius of a soap bubble is 'r ', surface...

Radius of a soap bubble is 'r ', surface tension of soap solution is T. Then without increasing the temperature, how much energy will be needed to double its radius

A

`32 pi r^2 T`

B

`24 pi r^2 T`

C

`16 pi r^2 T`

D

`8 pi r^2 T`

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