In Coulomb's law, the constant k is the Coulomb's constant.

k is expressed as:

$\overline{){\mathbf{k}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{4}{\mathbf{\pi \epsilon}}_{\mathbf{0}}}}$

The value of the constant k in coulomb's law is :

a. 9 × 10^{3}

b. 9 × 10^{5}

c. 9 × 10^{7}

d. 9 × 10^{9}

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