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Q.

A barometer tube reads 76 cm of mercury. If the tube is gradually inclined at an angle of 60^o with vertical, keeping the open end immersed in the mercury reservoir, the length of the mercury column will be

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a

76 cm

b

$38 \sqrt{3} c m$

c

38 cm

d

152 cm

answer is A.

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Detailed Solution

Question Image

$\begin{array}{l} \cos 60^{\circ} = \frac{h}{l} \\ \Rightarrow l = \frac{h}{\cos 60^{\circ}} = \frac{76}{1 / 2} \\ ∴ l = 152 cm \end{array}$

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