Point Charge Potential
The potential (voltage) of a point charge can be evaluated by calculating the work necessary to bring a test charge q in from an infinite distance to some distance r. The zero of potential is chosen at infinity.
Considering a radial path from a to b, the workdone by the Coulomb force is obtained from a line integral which in this case becomes just apolynomial integral since we are moving along a straight radial line: |
For a positive charge q, the Coulomb force does positive work in moving it from a to b, so that represents a drop in potential energy.
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