Water rise in a capillary upto an extension height such that upwa… - Vidyadip

MCQ

Water rise in a capillary upto an extension height such that upward force of surface tension balances the force of $75 \times 10^{-4}\,N$ due to weight of water. If surface tension of water is $12 \times 10^{-2}\,N/m$. The internal circumference of the capillary must be

A
$12.5 \times 10^{-2}\,m$
B
$6.5 \times 10^{-2}\,m$
C
$1.25 \times 10^{-2}\,m$
✓
$6.25 \times 10^{-2}\,m$

✓

Answer

Correct option: D.

$6.25 \times 10^{-2}\,m$

d
$\mathrm{T}(2 \pi \mathrm{r})=$ weight

$\Rightarrow 2 \pi r=\frac{75 \times 10^{-4}}{12 \times 10^{-2}}=6.25 \times 10^{-2} \mathrm{m}$

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