MHT CET 2024 Physics question
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 1 mm. The wave done in the process is (surface tension of water = 72 )
Answer: (C)
Solution
A water film has two free surfaces, so the work done in increasing its area is with m. Using the given N/m:
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