Question

A $20\text{cm}$ long capillary tube is dipped in water. The water rises upto $8\text{cm}$. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be

• A. $8\text{cm}$
• B. $10\text{cm}$
• C. $4\text{cm}$
• D. $20\text{cm}$

Answer 1

The correct option is D $20\text{cm}$

On freely falling elevator, the gravitational force on water will be zero therefore, surface tension will not be cancelled by any other force and hence, water will be raised to full length of capillary tube.