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Work done in increasing the size of a so...

Work done in increasing the size of a soap bubble from a radius of `3 cm` to `5 cm` is nearly. (surface tension of soap solution `= 0.3 Nm^(-1))`

A

`0.2 pi m J`

B

`2 pi m J`

C

`0.4 pi mJ`

D

` 4 pi mJ`

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