A long capillary tube of radius \( r \) is put in contact with surface of a perfectly wetting liquid of density \( \rho \) and very low viscosity. What maximum height \( h \) the liquid can rise inside the capillary? Here height is measured above the level of the liquid outside the capillary. Surface tensions of the liquid and acceleration due to gravity are denoted by \( \sigma \) and \( g \) respectively.
(A) \( h=\frac{2 \sigma}{\rho g r} \)
(B) \( h=\frac{4 \sigma}{\rho g r} \)
(C) \( \frac{2 \sigma}{\rho g r}\)<h<4\( \sigma \)/\( \rho \)gr
(D)Information insufficient
Ans.C
