how to find the locus of points where potential is same due to two unequal charges separated by a distance?

Solutions for potential due to 2 point charges

Electric potential due to a point charge =

We will begin the electrical potential due to point charges

r denotes the position in space at which the potential is measured and r_i denotes the position of the charge.

Because we are considering only the x, y plane, z = 0 and because the two charges are on the x-axis, one at X₁ and the other at X₂ then yi, zi = 0,