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Question

A thin liquid film formed between a U - shaped wire and supports a light weight of 1.5×102 N (see figure). The length of the slider is 30 cm and its weight is negligible. The surface tension of the liquid film is


A
0.0125 Nm1
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B
0.1 Nm1
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C
0.05 Nm1
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D
0.025 Nm1
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Solution

The correct option is D 0.025 Nm1
Here, W=1.5×102 N
L=30 cm=30×102 m
As film has two surface.
Force due surface tension=2×L×S

At equilibrium, weight of the give block is balanced by force due to surface tension, i.e., 
2L×S=W
S=W2L=1.5×102 N2×0.3 m=0.025 N/m

Physics

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