MHT CET 2025 Physics question
A water drop of 0.01 cm is squeezed between two glass plates and spreads in to area of 10 cm. If surface tension of water is 70 dyne/cm then the normal force required to separate glass plates from each other will be
Answer: (B)
Solution
The film thickness is cm. The film has two free surfaces, and the pressure difference across the curved edge is , so the force needed to pull the plates apart is $F=Δ
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