Final answer:
The electric potential at a point is positive near a positive charge and negative near a negative charge. To rank locations from most positive to most negative electric potential, one would list them from closest to the positive charge to closest to the negative charge.
Step-by-step explanation:
The electric potential at a point in space is defined as the amount of electric potential energy a unitary point charge would have at that location. When comparing the electric potential at various points near two charges, it's evident that the potential will be most positive near the positive charge and most negative near the negative charge.
Given locations a to f, without the explicit positions or a diagram, the general rule is that points closer to the positive charge will have a higher (more positive) potential, while those closer to the negative charge will have a lower (more negative) potential. If points are equidistant from both charges, they will have an intermediate potential, closer to zero. Lastly, points very far from both charges will approach a potential of zero, since the electric potential tends to zero at infinity.
Therefore, to rank the points from most positive to most negative electric potential, one would simply list them starting with the point closest to the positive charge and ending with the point closest to the negative charge, considering any points that may lie at similar distances from both charges.