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A vertical capillary tube with inside radius 0.25 mm is submerged into water so that the length of its part protruding over the water surface is equal to 25 mm . surface tension of water is 73 10⁻³ N / m and angle of contact is zero degree for glass and water, acceleration due to gravity is 9.8 m / s ^2 . Then choose correct statement. (where R is radius of meniscus and h is height of water in capillary tube.)

Options

  1. AR=0.25 ~mm
  2. Bh =59.6 ~mm
  3. CR=0.60 ~mm
  4. Dh =25 ~mm

Correct answer

D. h =25 ~mm

Step-by-step solution

Capillary height h= 2 ~T r g h =59.6 ~mm here 59.6 mm is greater than the protruding part hence water will rise in the capillary of insufficient height 25 mm . Now, R= 2 T hrg =0.6 ~mm

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