First slide

Surface tension and surface energy

Question

Force necessary to pull a circular plate of 5 cm radius from water surface for which surface tension is 75 dynes/cm, is

Moderate

A

30 dyne
B

60 dynes
C

750 dynes
D

750 $π$ dynes

Solution

The total length of the circular plate on which the force will act $= 2 π R$
Force to pull dynes $= 2 π R T = 2 \times π \times 5 \times 75 = 750 π$ dynes

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