In a vertical $U-$tube containing a liquid, the two arms are maintained at different temperatures ${t_1}$ and ${t_2}$. The liquid columns in the two arms have heights ${l_1}$ and ${l_2}$ respectively. The coefficient of volume expansion of the liquid is equal to
In a vertical $U-$tube containing a liquid, the two arms are maintained at different temperatures ${t_1}$ and ${t_2}$. The liquid columns in the two arms have heights ${l_1}$ and ${l_2}$ respectively. The coefficient of volume expansion of the liquid is equal to
- A
$\frac{{{l_1} - {l_2}}}{{{l_2}{t_1} - {l_1}{t_2}}}$
- B
$\frac{{{l_1} - {l_2}}}{{{l_1}{t_1} - {l_2}{t_2}}}$
- C
$\frac{{{l_1} + {l_2}}}{{{l_2}{t_1} + {l_1}{t_2}}}$
- D
$\frac{{{l_1} + {l_2}}}{{{l_1}{t_1} + {l_2}{t_2}}}$
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