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A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5 x10–2N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film i

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5 x10–2N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film i

Grade:11

2 Answers

Raghavendra Narayan
32 Points
7 years ago
For a liquid film ,the force F is given by;
 
F = 2 x (T) X (L)
 
 
1.5 ​​X 10-2=2 X T X (0.3)
 
 
T=2.5 X 10-2=0.025N/m.
 
 
The weight of the  slider is negligable hence the surface tension ofliquid  film is 0.025N/m
Rishi Sharma
askIITians Faculty 646 Points
3 years ago
Dear Student,
Please find below the solution to your problem.

For a liquid film ,the force F is given by;
F = 2 x (T) X (L)
1.5​​X10-2=2 X T X (0.3)
T=2.5 X 10-2=0.025N/m.
The weight of the slider is negligable hence the surface tension ofliquid film is 0.025N/m

Thanks and Regards

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