A film of water is formed between two straight parallel wires each 10 cm long and at separation 0.5 cm. Calculate the work required to increase 1 mm distance between wires. Surface tension = 72 
10 -3 N/m.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(1.44 
10 -5 J)
Sol.
The process is shown in the figure. As we have to produce 2 films; so
Δ W = (2 Δ A) T
= 2 [10 cm × 0.6 cm – 10 cm × 0.5 cm] × 72 × 10 –3 
= 2 × (10 × 10 –2 m) (0.1 × 10 –2 m) × 72 × 10 –3 
= 1.44 × 10 –5 J
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