MHT CET 2022 Physics question
A square frame of each side 'L' is dipped in a soap solution and taken out. The force acting on the film formed is (T = surface tension of soap solution)
Answer: (A)
Solution
A soap film has two free surfaces (front and back), and each surface exerts a pull per unit length along the whole boundary. The perimeter of the square frame is . Total force on
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