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Q.

The liquid shown in fig. in the arms are mercury (specific gravity = 13.6)and water. If the difference of heights of the mercury  columns is 2 cm, find the height h of the water column.

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a

27 cm

b

30 cm

c

35 cm

d

40 cm

answer is A.

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Detailed Solution

Since we know that pressures are identical at equal levels in identical media, pressure at A = pressure at B.

fwgh=fmaxgH ⇒h=13.6×=27.2≈27cm

Hence the correct answer is 27cm.

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