Mechanical Properties of Fluids

Question: A film of water is formed between two straight parallel wires of length 10cm each separated by 0.5 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 =$7.2\times {{10}^{-2}}N/m)$

1) $7.22\times {{10}^{-6}}\,Joule$

2) $1.44\times {{10}^{-5}}\,Joule$

3) $2.88\times {{10}^{-5}}\,Joule$

4) $5.76\times {{10}^{-5}}\,Joule$

Solution:

Explanation: No Explanation

Surface tension surface energy

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