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Wax is coated on the inner wall of a capillary tube and the tube is then dipped in water. Then, compared to the unwaxed capillary, the angle of contact and the height h upto which water rises change. These changes are :

Options

  1. Aincreases and h also increases
  2. Bdecreases and h also decreases
  3. Cincreases and h decreases
  4. Ddecreases and h increases

Correct answer

C. increases and h decreases

Step-by-step solution

Angle of contact = T _ SA - T _ SL T _ LA when water is on a waxy or oily surface T _ SA 90^ liquid level in capillary tube fall. i.e., h decreases

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