MHT CET 2022 Physics question
A water drop of radius 'r' and volume 'V' is kept in between the two identical glass plates such that it forms a thin layer of area 'A' between the plates. A force 'F' is applied such that the two plates separate from each other. The surface tension 'T' of the liquid is
Answer: (A)
Solution
The thin layer has thickness . The film is bounded by a curved meniscus of radius , which produces an excess (negative) pressure in the liquid relative to the outside (for thin layers the other curvature is negligible). The
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