MHT CET 2025 Physics question
Pure water rises through a height h in a capillary tube of internal radius r. Surface tension of water is T. The pressure difference between the water level in the container and the lowest point of the concave meniscus is
Answer: (C)
Solution
Pure water wets glass, so the angle of contact is and the meniscus is a hemisphere of radius equal to the tube radius. The excess pressure across a concave liquid surface is : the pressure just below the meniscus is lower than the atmospheric pressure above it by this
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