Coulomb's Law of Electrostatics/Also presented as

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Coulomb's Law of Electrostatics: Also presented as

Force Between two Like Charges

Coulomb's Law of Electrostatics can also be presented as:

$(1): \quad \mathbf F_{a b} \propto \dfrac {q_a q_b \hat {\mathbf r}_{a b} } {r^2}$
where $\hat {\mathbf r}_{a b}$ is the unit vector in the direction from $a$ to $b$.
$(2): \quad \mathbf F_{a b} \propto \dfrac {q_a q_b} {\size {\mathbf r_a - \mathbf r_b}^3} \paren {\mathbf r_a - \mathbf r_b}$
where $\mathbf r_a$ and $\mathbf r_b$ are the position vectors of $q_a$ and $q_b$ respectively.