Question

When a cylindrical tube is dipped vertically into a liquid, the angle of contact is ${140}^{\circ }$. When the tube is dipped with an inclination of ${40}^{\circ }$, then the angle of contact is:

• A. ${100}^{\circ }$
• B. ${140}^{\circ }$
• C. ${180}^{\circ }$
• D. ${60}^{\circ }$

Answer 1

The correct option is B ${140}^{\circ }$

Angle of contact is one of the characteristics of interaction of a liquid with a solid body.
So, it does not depend on inclination of the capillary tube.
So, here contact angle will be ${140}^{\circ }$ only.