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Water rises to a height of 30 mm in a capillary tube. If the radius of the capillary tube is made 3/4 of its previous value. The height to which the water will rise in the tube is

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30 mm

20 mm

40 mm

10 mm

answer is C.

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Detailed Solution

$∵ h_{1} r_{1} = h_{2} r_{2}$

$\Rightarrow h_{2} = h_{1} (\frac{r_{1}}{r_{2}}) = 30 \times 4 / 3 = 40 mm$

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