First slide

Surface tension and surface energy

Question

A square frame of side L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is T, the force acting on the frame will be

Moderate

A

2 TL
B

4 TL
C

8 TL
D

10 TL

Solution

Force on each side =2 TL (due to two surfaces)
$∴$ Force on the frame = 4(2 TL)= 8TL

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