NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

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A film of water is found between two straight parallel wires of length 10 cm each separated by 0.2 cm. If their separation is increased by 1 mm, while still maintaining their parallelism, how much work will have to be done? (surface tension of water is

7.2 \times {10^{ - 2}}\mathrm{N}{\mathrm{m}^{ - 1}}

)

View answer and explanation

Correct option: B

1.44 \times {10^{ - 5}}

Option B (

1.44 \times {10^{ - 5}}

J) is correct because it is the work done calculated from the surface tension and the change in area of the water film.

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