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How to solve 

Asked by amitjena226 21st December 2017, 10:39 PM
Answered by Expert
Soap bubble has two free surfaces. Hence workdone by surface tension force  is 2T ×ΔA . T is surface tension and ΔA is change in surface area.
begin mathsize 12px style capital delta A space equals space 4 pi open parentheses open parentheses 2 R close parentheses squared minus R squared close parentheses space equals space 12 pi R squared end style
workdone = 24×Π×T×R2
Answered by Expert 22nd December 2017, 1:48 PM
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