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A soap bubble of radius 1/sqrtpi cm is e...

A soap bubble of radius `1/sqrtpi` cm is expanded to a bubble of radius `2/sqrtpi`cm. If the surface tension of soap solution is 30dyne/cm, the work done is

A

A. 180 ergs

B

B. 360 ergs

C

C. 720 ergs

D

D. 960 ergs

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The correct Answer is:
C
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