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Surface tension problem....I need proof as to how the answer came to be Td....

Surface tension problem....I need proof as to how the answer came to be Td....

Question Image
Grade:11

1 Answers

Arun
25763 Points
11 months ago
T(surface tension)
d-diameter of loop
At equillibrium
2TΔl=2Fsin2θ
since θ is very small so sin2θ2θ
TΔl=Fθ/2
Δl=rθ=2dθ
so, T×2dθ=F×2θ
F=Td.
option A is correct

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