A thin liquid film formed between a U -shaped wire and a light slider supports a weight of 1.5× 10- 2N . The length of the slider is 30cm and its weight is negligible. The surface tension of the liquid film is:

Question

A thin liquid film formed between a U -shaped wire and a light slider supports a weight of 1.5× 10- 2N . The length of the slider is 30cm and its weight is negligible. The surface tension of the liquid film is: <img class="img-fluid question-image" alt="Question" src="https://cdn.tardigrade.in/q/nta/p-wkhio3ypk8ucjyf7.jpg" /> (A) 0.0125Nm- 1 (B) 0.1Nm- 1 (C) 0.05Nm- 1 (D) 0.025Nm- 1

Tardigrade Admin · Accepted Answer

2Tl=W T=(W/2 l)=(1 . 5 × 10- 2/2 × 0 . 3) =2.5× 10- 2Nm- 1

Q. A thin liquid film formed between a $U$ -shaped wire and a light slider supports a weight of $1.5 \times 1 0^{- 2} N$ . The length of the slider is $30 c m$ and its weight is negligible. The surface tension of the liquid film is :

$0.0125 N m^{- 1}$

$0.1 N m^{- 1}$

$0.05 N m^{- 1}$

$0.025 N m^{- 1}$

$2 Tl = W$
$T = \frac{W}{2 l} = \frac{1.5 \times 1 0 ^{- 2}}{2 \times 0.3}$
$= 2.5 \times 1 0^{- 2} N m^{- 1}$

Q. A thin liquid film formed between a U -shaped wire and a light slider supports a weight of 1.5×10−2N . The length of the slider is 30cm and its weight is negligible. The surface tension of the liquid film is :

0.0125Nm−1

0.1Nm−1

0.05Nm−1

0.025Nm−1