MHT CET 2025 Physics question
A rectangular film of liquid is expanded from (5 cm x 4 cm) to (7 cm x 8 cm). If the work done is J, the surface tension of the liquid is (nearly)
Answer: (B)
Solution
A liquid film has two free surfaces, so work done . Initial area cm, final area cm, increase cm m. Then \dfrac{W}${2Δ
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