The work done in increasing the size of a soap film from 10 cm× 6 cm to 10 cm × 11 cm is 3 ×10 -4 joule. The surface tension of the film is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
∴ ∴ 
(Soap film has two surfaces)
= 
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