If the surface tension of water is \(0.06\) N/m², then the capillary rise in a tube of diameter \(1\) mm is: \((\theta = 0^{\circ})\)
1. \(1.22\)m
2. \(2.44\)cm
3. \(3.12\)cm
4. \(3.86\) cm

If a capillary tube is partially dipped vertically into liquid and the levels of the liquid inside and outside are same, then the angle of contact is: