Home
Class 11
PHYSICS
A soap film in stretched over a reclangu...

A soap film in stretched over a reclangular vertical wire frame as shown in the figure, what forces hold section abod in equilibrium ?

Text Solution

Verified by Experts

The correct Answer is:
Surface tension forces `F_(ab), F_(cd)` and weight. Equilibrium only `F_(ab) gt F_(cd)` and this is due to difference in concentration of soap solution in film.

The `FBD` of part abod is as shown. The surface tension forces `F_(ab)` upward, `F_(cd)` downward and weight `(w)` of part abod are holding the part abcd in equilibrium.
`F_(ab) - F_(cd) = w`.
Clearly `F_(ab) gt F_(cd)` and this is due to difference in concentration of soap solution in film.
Promotional Banner

Topper's Solved these Questions

  • SURFACE TENSION

    RESONANCE|Exercise Exercise- 1 PART - II|17 Videos

  • SURFACE TENSION

    RESONANCE|Exercise Exercise- 2 PART - I|7 Videos

  • SURFACE TENSION

    RESONANCE|Exercise Advanced Level Problems|18 Videos

  • STRING WAVES

    RESONANCE|Exercise Exercise|32 Videos

  • UNITS, DIMENSION & MEASUREMENT

    RESONANCE|Exercise Exercise|27 Videos

Similar Questions

Explore conceptually related problems

A soap film is created in a small wire frame as shown in the figure. The sliding wire of mass m is given a velocity u to the right and assume that u is small enough so that film does not break. Plane of the film is horizontal and surface tension is T, then time to region the original position of wire is equal to :

A uniform bar of mass m is supported by a pivot at its top about which the bar can swing like a pendulum. If a force F is applied perpendicular to the lower end of the bar as shown in figure, what is the value of F in order to hold the bar in equilibrium at an angle (theta) from the vertical

A wire is wound over a pencil and placed over a scale as shown in the figure. The diameter of the given wire is "________" .

Calculate force on a dipole in the surrounding of a long charged wire as shown in the figure.

A spool is pulled by a force in vertical direction as shown in figure . What is the direction of friction in this case? The spool does not loose contact with the ground.

A light wire AB of length 10 cm can slide on a vertical frame as shown in figure. There is a film of soap solution trapped between the frame and the wire. Find the load W that should be suspended from the wire to keep it in equilibrium. Neglect friction. Surface tension of soat solution =25 dyne cm^-1. Take g=10 ms^-2

A wire wound over a rod and placed over a scale, as shown in figure. Calculate the radius of the wire.