Electrostatic Potential and Capacitance

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The electric potential at a point due to a system of point charges is equal to the algebraic sum of potentials due to all individual charges of the system at that point.

Consider a system of charges q₁, q₂,…, q_n with position vectors r₁, r₂,…,r_n relative to some origin. The potential V₁ at P due to the charge q₁, the potential V₂ at P due to q₂ and V_n due to qn are given by

By the superposition principle,

V = V₁ + V₂ + ...V_n