In a $U-$tube as shown in figure, water and oil are in the left side and right side of the tube respectively. The helghts from the bottom for water and oil columns are $15\; \mathrm{cm}$ and $20\; \mathrm{cm}$ respectively. The density of the oil is......$kg/{m}^{3}$
[take $\rho_{water} \left.=1000 \;\mathrm{kg} / \mathrm{m}^{3}\right]$
NEET 2019, Medium
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$\rho_{oil} \mathrm{h}_{\text {oil }}={ \rho_{water} } \mathrm{h}_{\text {water }} $
$\Rightarrow \rho_{oil} =\frac{1000(15)}{20}=750 \mathrm{kg} \mathrm{m}^{-3}$
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