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Question

# A mercury barometer has a column height of 76 cm. What will be the height of the column if the mercury is replaced with an oil having a density of 760 kg m−3? (Density of mercury is 13600 kg m−3)​

A
13.6 m
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B
27.2 m
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C
76 cm
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D
23.8 m
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Solution

## The correct option is A 13.6 m Liquid in barometer exert pressure on its base equal to the atmospheric pressure.​ If the density of the liquid is low, more height will be required to maintain the same pressure.​ So, from the formula h=Pρg (from P=ρgh) we can find height ‘h’ if density ‘ρ’ is changed, for given atmospheric pressure P.​

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