# Lienard-wichert potentials

## Homework Statement

I want to calculate the lienard-wichert vector potential, based on the retarded potential expression given in Heald-Marion (classical electromagnetic radiation).

## Homework Equations

I get: A=v$$\Phi$$, where $$\Phi$$ is the lienard-wichert scalar potential and v is the charge velocity. I am missing a factor of 1/c. I think i'm probably making a stupid mistake somewhere in there, the problem looks really simple. I might be making the wrong variable change or something.

## The Attempt at a Solution

I get: A=v$$\Phi$$, where $$\Phi$$ is the scalar potential.

Thanks!