First slide

Surface tension and surface energy

Question

The force required to separate two glass plates of area $10^{- 2} m^{2}$ with a film of water 0.05 mm thick between them, is (Surface tension of water is $70 \times 10^{- 3}$ N/m)

Moderate

A

28 N
B

14 N
C

50 N
D

38 N

Solution

Force required to separate the plates
$F = \frac{2 TA}{t} = \frac{2 \times 70 \times 10^{- 3} \times 10^{- 2}}{0 .05 \times 10^{- 3}} = 28 N$

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