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The figure shows a soap film in which a ...


The figure shows a soap film in which a closed elastic thread is lying. The film inside the thread is pricked. Now the sliding wire is moved out so that the surface area increases. The radius circle of the circle formed by elastic thread will

A

increase

B

decreases

C

remains same

D

data insufficient

Text Solution

Verified by Experts

The correct Answer is:
C
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A wire forming a loop is dipped into soap solution and taken out so that a film of soap solution is formed. A loop of 6.28 cm long thread is gently put on the film and the film is pricked with a needle inside the loop. The thread loop takes the shape of a circle. Find the tension in the thread. Surface tension of soap solution =0.030Nm^-1 .

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There is a horizontal film of soap solution. On it a thread is placed in the form of a loop. The film is punctured inside the loop and the thread becomes a circular loop of radius R . If the surface tension of the soap solution be T , then the tension in the thread will be :

There is a howizontal film of soap solution. On it a thread is placed in the form of a loop. The film is pierced inside the loop and the thread becomes a circular loop of radius R . If the surface tension of the loop be T , then what will be the tension in the thread?

A film of soap solution is formed on a loop frame loop of 6.28 cm long thread is gently put on the film and the film is broken with a needle inside the loop. The tread loop takes the shape of a circle. Find the tension in the thread. Surface tension of soap solution = 0.030 n//m .

Figure shows a spool with thread wound on it placed on a smooth plane inclined at angle from horizontal. The spool has mass m, edge radius R , and is wound up to a radius r. its moment of inertia about its own axis is I . The free end of the thread is attached as shown in the figure. So that the thread is parallel to the inclined plane. T is the tension in the thread. Which of the following is correct?

ALLEN-ELASTICITY, SURFACE TENSION AND FLUID MECHANICS-Exercise 2 (One or more than one correct answer)
  1. Find out the elongation in block. If mass area of cross-section and yo...

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  2. A steel rod of cross-sectional area 16 cm^(2) and two brass rods each ...

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  3. The figure shows a soap film in which a closed elastic thread is lying...

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  4. Water rises in a capillary tube to a certain height such that the upwa...

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  5. In a U-tube diamter of two limbs are 0.5 cm and 1 cm respectively and ...

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  6. When water rises in a capillary tube of radius r to height h, then its...

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  7. There are two thin films A of liquid and B of polythene, identical in ...

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  8. A capillary of the shape as shown is dipped in a liquid. Contact angle...

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  9. The spring balance A reads 2 kg with a block m suspended from it. A ba...

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  10. A steel ball is floating in a trough of mercuty. If we fill the empty ...

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  11. A ballong filled with air is weighted so that it barely floats in wate...

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  12. A small ball of density rho is immersed in a liquid of density sigma(g...

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  13. A solid uniform ball having volume V and density rho floats at the int...

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  14. A sperical ball of radius r and relative density 0.5 is floating in eq...

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  15. Three blocks, labeled A, B and C are floating in water as shown in the...

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  16. The cylindrical tube of a spray pump has radius R, one end of which ha...

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  17. A sylindrical vessel filled with water is released on an inclined surf...

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  18. A cylindrical container of radius 'R' and height 'h' is completely fil...

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  19. A small uniform tube is bent into a circle of radius r whose plane is ...

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  20. A U-tube of base length l filled with the same volume of two liquids o...

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