Q.

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
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