A tube with both ends open floats vertically in water. Oil with a density \( 800 \mathrm{~kg} / ...

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A tube with both ends open floats vertically in water. Oil with a density \( 800 \mathrm{~kg} / \mathrm{m}^{3} \) is poured into the tube. The tube is filled with oil upto the top end in equilibrium state. The portion out of the water is of length \( 10 \mathrm{~cm} \). Find the length of oil column :
Figure \( 7.81 \)
(A) \( 50 \mathrm{~cm} \)
(B) \( 60 \mathrm{~cm} \)
(C) \( 90 \mathrm{~cm} \)
(D) \( 100 \mathrm{~cm} \)
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