The diagram shows a simple mercury barometer.Which of the following does not cause the height of the mercury column to vary ?
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Atmospheric pressure is directly proportion to the height of mercury.
pressure due Weight of mercury in column is equal to atmospheric pressure, if g will vary, height should adjust so as to keep $W$ same.
Leakage of air inside the tube will disturb the vacuum, due to which pressure inside the tube will become equal to atmospheric pressure and height of mercury will become $0.$
Evaporation of mercury does not cause the height to vary, because it doesn't not change the pressure at surface of reservoir.
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