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What is the work done in blowing a soap ...

What is the work done in blowing a soap bubble of radius r and surface tension S?

A

` pi r ^ 2 sigma `

B

` 2pi r ^ 2 sigma `

C

` 4pi r ^ 2 sigma `

D

` 8 pi r ^ 2 sigma `

Text Solution

Verified by Experts

The correct Answer is:
D
W = S.E. = ` 2 xx ( 4 pi r ^ 2 ) sigma `
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