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A verticle U-tube of uniform inner cross...

A verticle U-tube of uniform inner cross section contains mercury in both sides of its arms. A glycerine (density`=1.3g//cm^3)` column of length 10 cm is introduced into one of its arms. Oil of density `0.8 gm//cm^3` is poured into the other arm until the upper surfaces of the oil and glycerine are at the same horizontal level. Find the length of the oil column, density of mercury`=13.6 g//cm^3`

A

10.4 cm

B

8.2 cm

C

7.2 cm

D

9.6 cm

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