Question

When a cylindrical tube is dipped vertically into aliquid, the angle of contact is 140°. When the tube isdipped with an inclination of 40', angle of contact is​

Answer 1

Angle of contact is independent of tilting angle.

Explanation:

Given data:

The angle of contact = 140°

The angle of  inclination = 40°

• If the tube is inclined at an angle of 40° then the height of the tube will be same as the vertical height.
• Only slant height will be changed, because "hs" depends on angle θ.
• Hence the pressure will be same and equal to atmospheric pressure.
• The meniscus of surface will also be same thus the angle of contact will also be same.

Thus Angle of contact is independent of tilting angle.

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