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MHT CET2017PhysicsMechanical Properties of Fluids

When one end of the capillary is dipped in water, the height of the water column is h . The upward force of 105 dyne due to surface tension is balanced by the force due to the weight of the water column. The inner circumference of the capillary is (Surface tension of water = 7 × 10 - 2 N m - 1 )

Options

  1. A1 . 5   cm
  2. B2   cm
  3. C2 . 5   cm
  4. D3   cm

Correct answer

A. 1 . 5   cm

Step-by-step solution

F = 105 d y n e = 105 × 10 - 5 N , T = 7 × 10 - 2 N m - 1 2 π r T = F 2 π r = F T = 105 × 10 - 5 7 × 10 - 2 = 15 × 10 - 3 m = 1.5 × 10 - 2 m = 1.5 cm

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