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## Homework Statement

My question is one of clarification about electric potential.

## Homework Equations

See Below

## The Attempt at a Solution

I understand that when electric potential is defined at infinity to be zero for a series of point charges, the potential is simply kq/r. My question is is it possible to define zero to be at the origin, and if so what would the new expression be. It would seem that the integral would yield a 1/0 term which would be undefined.