Question

Figure shows a capillary tube $C$ dipped in a liquid that wets it. The liquid rises to a point $A$. If we blow air through the horizontal tube $H$, what will happen to the liquid column in the capillary tube?

• A. level will rise above $A$
• B. level will fall below $A$
• C. level will remain at $A$
• D. It is difficult to predict

Answer 1

The correct option is A level will rise above $A$

When air is blown into tube $H$ velocity of air increases as a result pressure in the tube reduces(By Bernoulli theorem)

Due to this pressure difference more liquid will be pushed into the capillary tube.