If the surface tension of soap solution is T. what is the work done in blowing soap dabble of radius r ?
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a
πr2T
b
2πr2T
c
4πr2T
d
8πr2T
answer is D.
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Detailed Solution
A soap bubble has two surfaces in contact with air. So, the total surface area of the bubble =2×4πr2=8πr2 Work done = surface tension x increase in surface area =T8πr2−0=8πr2T