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The work done against surface tension in...

The work done against surface tension in blowing a soap bubble from a radius of 5 cm to 15 cm is (surface tension of soap solution is `30 xx 10^(-3) Nm^(-1)`)

A

`2.4 pi mJ`

B

`4.8 pi mJ`

C

`2.4 pi J`

D

`4.8 pi J`

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A
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