Question

A wire ring of 0.03m radius is rested on the surface of a liquid and then raised the full required is 0.003kg weight more before the fill breaks then it is after find the surface tension of liquid.

Answer 1

The surface tension of liquid is 0.15924 N/m

Radius of wire, r = 3cm

we know, effective length for wire , L = 2π(r)

• L = 2 × 3.14 × (3) × $10^{-2}$ m

• L = 6.28 × 3 × $10^{-2}$ m

• L =  18.84 x $10^{-2}$m = 0.1884 m

• force , F = mg = 3g × 10m/s²

• = 3 × $10^{-3}$ × 10 = 0.03N

now, surface tension, S = F/L = 0.03/0.1884

• S = 0.15924 N/m