In Problem 25.45, what is the difference in potential between the following two points on the x-axis: point-A at x = 0.1 m and point- B at x = 0.9 m? Which point is at the higher potential?

Problem 25.45

A point charge of +2.0 μC is placed at the origin of coordinates. A second, of −3.0 μC, is placed on the x-axis at x = 100 cm. At what point (or points) on the x-axis will the absolute potential be zero?