a wire ring of internal radius 3cm and external radius 3.2 cm is rested on the surface of a liquid and then raised .an extra pulling force equal to weight of 3.03g is required before the film breakes than its after.calculate the surface tension of the liquid

Open in App

Solution

Dear student,

$I n t h e c a s e o f t h e r i n g, t h e l i q u i d w e t s i t f r o m t w o s i d e s (i n s i d e a n d o u t s i d e) H e n c e e f f e c t i v e l e n g t h = 2 π (r_{i} + r_{e}) s o L = 2 \times 3.14 (3 + 3.2) \times 10^{- 2} L = 0.38 m F o r c e = 0.003 \times 10 = 0.03 N S u r f a c e t e n s i o n T = \frac{F}{L} = \frac{0.03}{0.38} T = 0.07 N / m$

Regards

Suggest Corrections

Similar questions

Q. A thin wire ring of

3 c m

radius float on the surface of a liquid. The pull required to raise the ring before the film breaks is

30.14 \times 10^{- 3} N

more than its weight. The surface tension of the liquid (in

N m^{- 1}

) is:

A ring of external and internal radii $r_{1}$ and $r_{2}$ just touches the horizontal surface of a liquid of surface tension $σ$ . The force required to pull the ring away from the surface is

Q. A thin metal ring of internal radius

8 cm

and external radius

9 cm

is supported horizontally from the pan of a balance so that it comes in contact with pure water in a glass vessel. If it is found that an extra weight of

7.48 g

is required to pull the ring out of pure water. The surface tension of water is
[Angle of contact of glass-pure water is

0^{\circ}

]

(

g = 10 {m/s}^{2}

)

Q. A ring having radius

2.5 cm

and mass

10 gram

floats on a liquid surface having surface tension

0.06 N/m

. Find force required to just lift the ring from liquid surface.

Q. A ring of radius r and weight W is lying on a liquid surface. If the surface tension of the liquid is T, then the minimum force required to be applied in order to lift he ring up-

Join BYJU'S Learning Program

​​a wire ring of internal radius 3cm and external radius 3.2 cm is rested on the surface of a liquid and then raised .an extra pulling force equal to weight of 3.03g is required before the film breakes than its after.calculate the surface tension of the liquid

Dear student, In the case of the ring, the liquid wets it from two sides(inside and outside)Hence effective length= 2π(ri+re)so L=2×3.14(3+3.2)×10-2L=0.38mForce=0.003×10=0.03NSurface tension T=FL=0.030.38T=0.07N/m Regards

a wire ring of internal radius 3cm and external radius 3.2 cm is rested on the surface of a liquid and then raised .an extra pulling force equal to weight of 3.03g is required before the film breakes than its after.calculate the surface tension of the liquid