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Question

A U-shaped wire is dipped in a soap solution, and removed. The thin soap film formed between the wire and the light slider supports a weight of 1.5 × 10¯² N (which includes the small weight of the slider). The length of the slider is 30 cm. What is the surface tension of the film ?


Solution

Given, the weight of the slider is 1.5× 10 2 N and the length is 30cm.

The total length of the film is,

L=2×30× 10 2 m =0.6m

The surface tension is given by the equation,

T= F L

Substituting the values in the above expression, we get:

T= 1.5× 10 2 N 0.6m =2.5× 10 2 N/m

Hence, the surface tension in the film is 2.5× 10 2 N/m .


Physics
Physics Part-II - NCERT
Standard XI

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