5. water rises in a capillary tube to a certain height such that the upward force due to surface

Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by 75 X 10^-4 N  force due to the weight of the liquid. If the surface tension of water is 6 X 10^-4 Nm^-1  , the inner circumference of the capillary must be

(a)  1.25 X 10^-2m

(b) 0.50 X 10^-2m

(c) 6.5X 10^-2m

(d) 12.5 X 10^-2m

Ans. d

(42)