A thin liquid film formed between a U-shaped | vedclass

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(A) liquid film has two surfaces (front and back). Therefore,the total force due to surface tension acting upwards on the slider is $F = 2TL$,where $T

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$0.025$

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(A) liquid film has two surfaces (front and back). Therefore,the total force due to surface tension acting upwards on the slider is $F = 2TL$,where $T$ is the surface tension and $L$ is the length of the slider.Given:Weight $W = mg = 1.5 	imes 10^{-2} \; N$Length $L = 30 \; cm = 0.3 \; m$For equilibrium,the upward force due to surface tension must balance the downward weight:$2TL = mg$Substituting the values:$2 	imes T 	imes 0.3 = 1.5 	imes 10^{-2}$$0.6 	imes T = 0.015$$T = \frac{0.015}{0.6} = 0.025 \; N m^{-1}$

$A$ thin liquid film formed between a $U$-shaped wire and a light slider supports a weight of $1.5 \times 10^{-2} \; N$ (see figure). The length of the slider is $30 \; cm$ and its weight is negligible. The surface tension of the liquid film is (in $; N m^{-1}$)

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