13. Water rises in a capillary tube when its one end is dipped vertically
Water rises in a capillary tube when its one end is dipped vertically in it, is 3 cm. If the surface tension of water is 75 × 10-3 N/m, then the diameter of capillary will be
(a) 0.1 mm
(b) 0.5 mm
(c) 1.0 mm
(d) 2.0 mm
Ans. c
(40)