# E&M fields of a moving point charge

1. May 9, 2005

### meteorologist1

Hi, I need help on the following question: Suppose a point charge q is constrained to move along the x-axis. Show that the fields at points on the axis to the RIGHT of the charge are given by

$$\vec{E} = \frac{q}{4\pi\epsilon_0}\frac{1}{r^2}(\frac{c+v}{c-v})\hat{x}$$ and $$\vec{B} = 0$$

What are the fields on the axis to the LEFT of the charge?

I'm thinking that I need to use the two formulas for E and B which are derived from the Lienard-Wiechert potentials.
See here: http://scienceworld.wolfram.com/physics/PointCharge.html

Thanks.