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By using Coulomb's law, define unit char...

By using Coulomb's law, define unit charge.

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In SI, the unit of charge is Coulomb. Putting value of `q_(1) = q_(2) = 1C, r =1 m` in `F = k(q_(1)q_(2))/r^(2)`, then `F = 1/(4pi epsilon_(0)) = 9 xx 10^(9)` N
Definition of 1 C : 1 C is the charge that when placed at a distance of 1 m from another charge of the same magnitude in vacuum experiences an electrical force of repulsion of magnitude `9 xx 10^9` N.
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