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A capillary tube of radius 0.2mm is dipped vertically in a beaker containing water if surface tension of water is 7 × 10^–2N/m the rise of water in the tube will be

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7mm

7cm

3.5mm

3.5cm

answer is B.

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Detailed Solution

$\begin{array}{l} r = 0 .2 mm, T = 7 \times 10^{- 2} N / m \\ h = \frac{2 Tcos θ}{ρgr} = 7 cm \end{array}$

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