The work done in blowing a soap bubble of radius r of the solution of surface tension T will be

8πr²T

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2πr²T

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4πr²T

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4/3πr²T

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Solution

The correct option is A
8πr²T

work done = change in surface area x surface tension

$W = T (A_{f} - A_{i}) = T (8 π r^{2})$

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