Question

Soapy water drips from a capillary tube. When the drop breaks away, the diameter
of its neck is D. The mass of the drop is m. Find the surface tension of soapy
water?

Answer 1

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Soapy water drips from a capillary tube. When the drop breaks away, the diameter of its neck is D. The mass of the drop is m. Find the surface tension of soapy water?-

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Answer

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Correct option is

C

πD

mg

We know that

\begin{aligned} f_{T} &=T L \quad\left[\begin{array}{l}T=\text { surface Tension } \\ L=\text { length in contact }]\end{array}\right.\\ \text { if Body is in equilibrium } \end{aligned}

f

T

=m

g

TxπD=mg(D= Diameter )

T=

πD

mg

Answer: (C)

πD

mg