Water rises to a height of 20 mm in a capillary . If the radius of the capillary is made $\large\frac{1}{3}$rd of its precious is made then what is the new value of the capillary rise?

Question

\[\begin {array} {1 1} (a)\;60\;mm & \quad (b)\;40\;mm \\ (c)\;30\;mm & \quad (d)\;10\;mm \end {array}\]