question_answer

The following observations were taken for determining surface tensiton T of water by capillary method :

Diameter of capilary, \[D=1.25\times {{10}^{-2}}m\] rise of water, \[h=1.45\times {{10}^{-2}}m\] Using \[g=9.80\,m/{{s}^{2}}\]and the simplified relation\[\text{T=}\frac{\text{rhg}}{\text{2}}\text{ }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{3}}}\,\text{N/m,}\] the possible error in surface tension is closest to:     [JEE Main 2017]

A)  2.4%

B)                   10%

C)  0.15%

D)       1.5%

Correct Answer: D

Solution :

[d]