Write the value of the Coulombian constant $k$ in $SI$ units.

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(N/A) The Coulombian constant $k$ is defined by the relation $k = \frac{1}{4\pi\epsilon_0}$.
Its value is approximately $8.98755 \times 10^9 \ N \cdot m^2/C^2$.
In most physics problems,it is approximated as $k \approx 9 \times 10^9 \ N \cdot m^2/C^2$.

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