Question

A barometer reads 76 cm of mercury. If the tube is gradually inclined at an angle of ${60}_0$ with gertical, keeping the open end immersed in the reservoir, the length of the mercury column will be :

• A. 152 cm
• B. 76 cm
• C. 38 cm
• D. $38\sqrt{3}cm$

Answer 1

The correct option is A 152 cm

REF.Image.

the mercury column will try to maintain in original height.

[pressure is $P=P_0+Pgh$

so h' has to be constant]

clearly from figure,

$Lsin\left({30}^{\circ }\right)=76\Rightarrow L=\frac{76}{sin\left({30}^{\circ }\right)}=152m.$