First slide

Surface tension and surface energy

Question

Radius of a capillary is $2 \times 10^{- 3} m .$ A liquid of weight $6 .28 \times 10^{- 4} N$ may remain in the capillary then the surface tension of liquid will be

Moderate

A

$5 \times 10^{- 3} N / m$
B

$5 \times 10^{- 2} N / m$
C

$5 N / m$
D

$50 N / m$

Solution

$T = \frac{F}{2 πr} = \frac{6 .28 \times 10^{- 4}}{2 \times 3 .14 \times 2 \times 10^{- 3}} = 5 \times 10^{- 2} N / m$

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