MHT CET 2023 Physics question
Consider a soap film on a rectangular frame of wire of area cm. If the area of the soap film is increased to cm, the work done in the process will be (surface tension of soap solution is N/m)
Answer: (D)
Solution
A soap film has two free surfaces, so the surface energy is area. Increase in area: . Work done: $W = 2T Δ A =
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