Write an equation for the electric potential due to a system of charges.

(N/A) The electric potential $V$ at a point due to a system of $n$ point charges $q_1, q_2, ..., q_n$ at distances $r_1, r_2, ..., r_n$ from the point is given by the algebraic sum of the potentials due to each individual charge.
The equation is:
$V = \sum_{i=1}^{n} \frac{1}{4\pi\epsilon_0} \frac{q_i}{r_i}$
Where:
$V$ is the total electric potential.
$\epsilon_0$ is the permittivity of free space.
$q_i$ is the $i^{th}$ charge.
$r_i$ is the distance of the $i^{th}$ charge from the point where the potential is calculated.