The maximum force, in addition to the weight required to pull a wire of 5.0 cm long from the surface of water at temperature 20°C is 728 dynes. The surface tension of water is

Question

The maximum force, in addition to the weight required to pull a wire of 5.0 cm long from the surface of water at temperature 20°C is 728 dynes. The surface tension of water is (A) 7.28 N/cm (B) 7.28 dyne/cm (C) 72.8 dyne/cm (D) 7.28 × 102 dyne/cm

Tardigrade Admin · Accepted Answer

T = (F/2l) =(728/2 ×5) ∴ T =72.8 dyne/cm <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/17ee9dc6e244a8e9238ca42dc96a14f9-.png" />

Q. The maximum force, in addition to the weight required to pull a wire of $5.0$ cm long from the surface of water at temperature $2 0^{\circ} C$ is $728$ dynes. The surface tension of water is

$7.28$ N/cm

$7.28$ dyne/cm

$72.8$ dyne/cm

$7.28 \times 1 0^{2}$ dyne/cm

$T = \frac{F}{2 l} = \frac{728}{2 \times 5}$
$∴ T = 72.8$ dyne/cm

Q. The maximum force, in addition to the weight required to pull a wire of 5.0 cm long from the surface of water at temperature 20∘C is 728 dynes. The surface tension of water is

7.28 N/cm

7.28 dyne/cm

72.8 dyne/cm

7.28×102 dyne/cm