The following observations were taken for determining

Question:

The following observations were taken for determining surface tensiton $\mathrm{T}$ of water by capillary method:

Diameter of capilary, $\mathrm{D}=1.25 \times 10^{-2} \mathrm{~m}$

rise of water, $\mathrm{h}=1.45 \times 10^{-2} \mathrm{~m}$

Using $g=9.80 \mathrm{~m} / \mathrm{s}^{2}$ and the simplified relation

$\mathrm{T}=\frac{\text { rhg }}{2} \times 10^{3} \mathrm{~N} / \mathrm{m}$, the possible error in surface tension is closest to :

  1. $2.4 \%$

  2. $10 \%$

  3. $0.15 \%$

  4. $1.5 \%$


Correct Option: , 4

Solution:

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