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  4. The surface tension of water is 75 dyne / cm. Find the minimum vertical force required to pull a thin wire ring up (refer figure) if it is initially resting on a horizontal water surface. The circumference of the ring is 20 cm and its. weight is 0.1 N :

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Q. The surface tension of water is $75 \,dyne / cm$. Find the minimum vertical force required to pull a thin wire ring up (refer figure) if it is initially resting on a horizontal water surface. The circumference of the ring is $20 \,cm$ and its. weight is $0.1 \,N$ :Physics Question Image

Mechanical Properties of Fluids

Solution:

$F _{\text {req }}= mg +2[ T (2 \pi R )]\left[ T =75 \times 10^{-3} N / m \right]$
$=0.1+2\left[75 \times 10^{-3}(0.2)\right]=0.130 \,N$