Question

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

• A. $152cm$
• B. $76cm$
• C. $\frac{76cm}{sin{30}^o}$
• D. $38cm$

Answer 1

The correct option is A $152cm$

$\text{Capillary rise due to pressure}$

$\text{difference so}$

$\sin 30=\frac{76}{l}$

$\frac{1}{2}=\frac{76}{\ell }$

$l=152cm$

Answer:-(A)