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A water film is formed between two paral...

A water film is formed between two parallel wires of 10 cm length. The distance of 0.5 cm between the wires is increased by 1mm. What will be the work done ? (Given, surface tension of water of `72 Nm^(-1)`)

A

288 erg

B

144 erg

C

72 erg

D

36 erg

Text Solution

Verified by Experts

The correct Answer is:
B
Work done, `W = 2 xx S xx Delta A`
`= 2 xx 72 xx (0.6 - 0.5) xx10 = 144` erg
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-SURFACE TENSION -Exercise 1
  1. The diameter of one drop of water is 0.2 cm. The work done in breaking...

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  2. The surface tension of a liquid is 5 Newton per metre. If a film is he...

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  3. A water film is formed between two parallel wires of 10 cm length. The...

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  4. The work done in blowing a soap bubble of volume V is W. The work done...

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  5. The excess pressure inside a spherical drop of water is four times tha...

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  6. Two liquid drop have diameters of 1 cm and 1.5 cm. The ratio of excess...

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  7. What should be the pressure inside a small air bubble of 0.1 mm radius...

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  8. A water drop is divided into 8 equal droplets. The pressure difference...

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  9. A glass tube of uniform internal radius r has a valve separating the t...

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  10. Match the following columns.

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  11. Find the difference of air pressure between the inside and outside of ...

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  12. If R is the radius of a soap bubble and S its surface tension, then th...

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  13. The excess pressure inside one soap bubble is three times that inside ...

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  14. There is a small bubble at one end and bigger bubble at other end of a...

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  15. Pressure inside two soap bubbles are 1.01 and 1.02 atmospheres. Ratio ...

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  16. A thread is tied slightly loose to a wire frame as shown in the figure...

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  17. If two soap bubbles of different radii are connected by a tube

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  18. The figure shows three soap bubbles A, B and C prepared by blowing the...

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  19. Two very wide parallel glass plates are held vertically at a small sep...

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  20. When two soap bubbles of radius r(1) " and " r(2)(r(2) gt r(1)) coales...

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