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  4. A very narrow capillary tube records a rise of 20 cm when dipped in water. When the area of cross-section is reduced to one-fourth of former value, water will rise to a height of

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Q. A very narrow capillary tube records a rise of $20 \, cm$ when dipped in water. When the area of cross-section is reduced to one-fourth of former value, water will rise to a height of

NTA AbhyasNTA Abhyas 2020

Solution:

$A \propto r^{2}$
$\therefore $ radius becomes half.
As $Hr=constant$ .
$\therefore H$ becomes double.