question_answer

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of \[1.5\times {{10}^{-2}}\] N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is: [AIEEE 2012]

A)  0.0125 \[N{{m}^{-1}}\]

B)       0.1 \[N{{m}^{-1}}\]

C)  0.05 \[N{{m}^{-1}}\]

D)       0.025 \[N{{m}^{-1}}\]

Correct Answer: D

Solution :

[d]

N/m