MHT CET 2022 Physics question
Two glass plates of area have 0.05 mm thick water film between them. The surface tension of water is N/m. The force required to separate two glass plates from each other is
Answer: (C)
Solution
A thin water film of thickness between two plates is bounded by a concave meniscus; the pressure inside the film is lower than atmospheric by (radius of curvature ). The force needed to pull the plates apart is
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