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surface tension of soap solution is 4*10...

surface tension of soap solution is `4*10^(-2) N/m`. If a soap bubble of radius `5 cm` is blown, then the amount of work done is

A

`8π*10^(-4) J`

B

`4π*10^(-4) J`

C

`2π*10^(-4) J`

D

`8π J`

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