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KCET2026PhysicsMechanical Properties of Fluids

A 30 cm long capillary tube is dipped in water, water rises upto a height of 10 cm due to capillarity. If this experiment is conducted in a freely falling water in an elevator, then the length of the water column becomes

Options

  1. A10 cm
  2. B20 cm
  3. C30 cm
  4. DZero

Correct answer

C. 30 cm

Step-by-step solution

The height of capillary rise is given by h = 2T g_ eff r In a freely falling elevator, the effective acceleration due to gravity is zero ( g_ eff = 0 ). Substituting g_ eff = 0 in the formula, the theoretical height h tends to infinity. However, the water column cannot exceed the physical length of the capillary tube. Once the water reaches the top, the radius of curvature of the meniscus adjusts to prevent overflow. Therefore, the water will rise to the full length of the capillary tube. Since the length of the ca

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