For a given loading on a rectangular plain concrete beam with an overall depth of $500 \mathrm{~mm}$, the compressive strain and tensile strain developed at the extreme fibers are of the same magnitude of $2.5 \times 10^{-4} .$ The curvature in the beam cross-section (in $m^{-1},$ round off to 3 decimal places), is

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For a given loading on a rectangular plain concrete beam with an overall depth of $500 \mathrm{~mm}$, the compressive strain and tensile strain developed at the extreme fibers are of the same magnitude of $2.5 \times 10^{-4} .$ The curvature in the beam cross-section (in $m^{-1},$ round off to 3 decimal places), is