A capillary tube with very thin walls is attached to the beam of a balance which is then equalized.
Channel: Doubtnut
Date: 2020-01-26

A capillary tube with very thin walls is attached to the beam of a balance which is then equalized. The lower end of the capillry is brought in contact with the surface of water after which an additional load of `P = 0.135 gm` force is needed to regain equilibrium. If the radius of the capillary is `(lambda)/(10)cm` then find `lambda` The surface tension of water is `70 \"dyne\"//\"cm\"`. `(g = 9.8 m//s^(2))`