# Question: start with the lienardwiechert potentials for a moving point chart...

###### Question details

Start with the Lienard-Wiechert potentials for a moving point chart A, φ and derive the electric and magnetic field for the charge:

Explicitly show what happens in the far-field approximation,
when one can neglect terms of order of the square of the ratio of
the source size divided by the distance to the field point (i.e.
O|r'_{max}|^{2}/R^{2}). Using this
approximation, derive the Poynting flux for the EM field assuming
one is far from the source, and can use the plane-wave
approximation. Explicitly calculate the time average poynting flux.
Use Gaussian units throughout.