First slide

Surface tension

Question

A thin liquid film formed between a U- shaped wire and light slider support a weight 1.5×10^–2N (see figure). The length of the slider is 30cm and its weight negligible. The surface tension of the liquid film is

Easy

A

0.0125Nm^–1
B

0.1Nm^–1
C

0.05Nm^–1
D

0.025Nm^–1

Solution

$\large F=T(2L); T=\frac {F}{2L}=\frac {1.5\times 10^{-2}}{2\times 30\times 10^{-2}}$
$\large =\frac {1.5}{60}=\frac {0.5}{20}=\frac {5}{200}=0.025N/m$

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