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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 <img alt="\theta" src="https://learn.car

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 \theta and the height h upto which water rises change. these changes are:

Option: 1

\theta increases and h also increases


Option: 2

\theta decreases and h also decreases


Option: 3

\theta increases and h decreases


Option: 4

\theta decreases and h  increases


Answers (1)

best_answer

 

 

 

 

when  \theta < 90^0  ( i.e concave meniscus) then, In this case, Liquid wets the solid surface

and when  \theta > 90^0  ( i.e Convex meniscus) then, In this case, Liquid does not wet the solid surface.

As given in the question

When Wax is coated on the inner wall of a capillary tube then water loses its ability to wet the sides of the tube.

So \theta \ will \ increase

and as

 h=\frac{2T\cos \Theta }{\rho gr}

i.e  h \ \ \alpha \ cos \theta so h will decrease

Posted by

Gunjita

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