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The value of $g$ at a place decreases by $2 \%$. The barometric height of mercury
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Increases by $2 \%$
$h=\frac{P}{\rho g} \therefore h \propto \frac{1}{g}$ ( $P$ and $\rho$ are constant)
If value of $g$ decreased by $2 \%$ then $h$ will increase by $2 \%$.
If value of $g$ decreased by $2 \%$ then $h$ will increase by $2 \%$.
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