Water rises to a height of 20 mm in a capillary if the radius of the capillary is made one third of its previous value then what is the new value of the capillary rise?

Explanation

To solve the problem, we will use the formula for capillary rise, which is given by:

\[ H = \frac{2T \cos \theta}{r \rho g} \]

Where:
- \( H \) is the height of the liquid column (capillary rise),
- \( T \) is the surface tension of the liquid,
- \( \theta \) is the angle of contact,
...