Question

Water rises to a height h in a capillary at the surface of earth. On the surface of the moon the height of water column in the capillary will be :-

• A. 6h
• B. $\frac{1}{6}h$
• C. h
• D. zero

Answer 1

The correct option is A 6h

It has been scientifically proven that the gravity on the surface of the moon is 1/6th the times that on the Earth i.e g/6

The capillary rise in a tube is given by the expression,

H = $\frac{2Tcos\theta }{\rho gr}$

So, for all other parameters being constant, if I take the capillary tube on the moon,

gravity would become g/6 and the rise will become 6 times i.e. $6h$