Question

Consider a group of charges q₁, q₂, q₃ ... such that Σq ≠ 0. Then equipotentials at a large distance, due to this group are approximately :

Two long straight thin wires AB and CD have linear charge densities 10 μC/m and −20 μC/m, respectively. They are kept parallel to each other at a distance 1 m. Find the magnitude and direction of the net electric field at a point midway between them.