Answer to Question #117615 in Physics for Bio

Question

In an electric field produced by a point charge Q (either positive or negative), a test charge is moved from a distance r to distance 2r. Explain how will you decide if ∆V between these two points is
positive or negative?

Answer 1

∆V between these two points is positive when two charge have opposite sign.

∆V between these two points is negative when two charge have the same sign.