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\[\begin {array} {1 1} (a)\;2 \times 10^9 \;Pa \\ (b)\;2 \times 10^6\;Pa \\ (c)\;2 \times 10^4\;Pa \\ (d)\;2 \times 10^{-4}\;Pa \end {array}\]

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Bulk modulus

$B= \large\frac{-\Delta PV}{$\Delta V}$

$\Delta P=h \rho g$

$\qquad= 200 \times 10^3 \times 10$

$\qquad= 2 \times 10^5 N/m^2$

$\large\frac{\Delta V}{V}=\large\frac{0.1}{100}$

$\qquad=10^{-3}$

$B= \large\frac{2 \times 10^6}{10^3}$

$\qquad= 2 \times 10^9 N/m^2$

Hence a is the correct answer

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