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MHT CET 2025 (20 Apr, Shift 2) · Angle of Contact & Capillarity

Angle of Contact & Capillarity question from MHT CET 2025 (20 Apr, Shift 2)

Q22MHT CET 2025 · 20 APR · SHIFT 2Medium

Angle of Contact & Capillarity

Pure water rises through a height hh 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

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Answer: (c)

  1. Pressure just below the meniscus is less than atmospheric by the excess pressure 2Tcos⁡θr\frac{2T\cos\theta}{r}.
  2. For pure water θ=0\theta = 0, so ΔP=hρg=2Tr\Delta P = h\rho g = \frac{2T}{r}.
  3. So the answer is (c) 2Tr\frac{2T}{r}.
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