MHT CET 2026 Physics question
In a capillary tube of radius 'R', a straight thin metal wire of radius 'r' is inserted symmetrically and one end of the combination is dipped vertically in water such that lower end of the capillary and thin wire are at same level. If 'T' is the surface tension of water and is the density of water then the rise of water in the capillary is
Answer: (B)
Solution
Water rises in the annular gap between the wire and the capillary wall. The surface tension acts along both the outer circle (radius ) and the inner circle (radius ) of contact, each with zero contact angle (water wets both), so the upward force is . The weight of the
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