Question

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 the new value of capillary rise will be ______.

Options

• `20/3`mm

• 60 mm

• `20/9`

• 180 mm

Answer 1

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 the new value of capillary rise will be 60 mm.

Explanation:

We know that the capillary rises

h = `(2sigmacostheta)/"pqr"`

⇒ `20xx1/3`

= `20/3`mm