A soap bubble of surface tension 
is blown to a diameter of 7 cm . If 
of work is done in blowing it further to make its diameter 14 cm , then the value of 
is 
( 
)
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
1. (11304) Soap bubble has two surfaces. Work done: 
Initial radius: 
, Final radius: 
Change in surface area (both surfaces): 
Therefore: 
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