The following observations were taken for determining surface tension of water by…

PHYSICS · Single correct · CBSE · Physics · Units and Measurements · Units and Measurements

Problem

The following observations were taken for determining surface tension

T

of water by capillary method : Diameter of capillary,

D = 1.25 \times 10^{-2}

m rise of water,

h = 1.45 \times 10^{-2}

m Using

g = 9.80 \text{ m/s}^2

and the simplified relation

T = \frac{r h g}{2} \times 10^3 \text{ N/m}, \text{ the possible error in surface tension}

is closest to : [Main 2017] (1) 2.4% (2) 10% (3) 0.15% (4) 1.5%