Coulomb's Law of Electrostatics/SI Units/Also presented as

Coulomb's Law of Electrostatics: Also presented as

 * Coulombs-Law.png

Coulomb's Law of Electrostatics expressed in SI units can also be presented as:


 * $(1): \quad \mathbf F_{a b} = \dfrac 1 {4 \pi \varepsilon_0} \dfrac {q_a q_b \hat {\mathbf r}_{a b} } {r^2}$
 * where $\hat {\mathbf r}_{a b}$ is the unit vector in the direction from $a$ to $b$.


 * $(2): \quad \mathbf F_{a b} = \dfrac 1 {4 \pi \varepsilon_0} \dfrac {q_a q_b} {\size {\mathbf r_a - \mathbf r_b}^3} \paren {\mathbf r_a - \mathbf r_b}$
 * where $\mathbf r_a$ and $\mathbf r_b$ are the position vectors of $q_a$ and $q_b$ respectively.