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  • A thin liquid film formed between a U- shaped wire and a light slider supports a weight of 1.5 10-2

A thin liquid film formed between a U- shaped wire and a light slider supports

a weight of 1.5 \times10-2 N ( see figure) The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is:

Option: 1

0.0125 Nm-1


Option: 2

0.1 Nm-1


Option: 3

0.05 Nm-1


Option: 4

0.025 Nm-1


Answers (1)

best_answer

The force due to the surface tension will balance the weight.

 

F=w

2TL=w

T=\frac{w}{2L}

Substituting the given values, we get

T=\frac{1.5\times 10^{-2}N}{2\times 30\times 10^{-2}m}=0.025Nm^{-1}

Posted by

Irshad Anwar

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