1. The problem statement, all variables and given/known data A particle of charge 'q' and energy 'E' which experiences an acceleration 'a', emits electromagnetic radiation. Show that the radiation from this particle which is emitted parallel to the magnetic field is expected to exhibit circular polarisation. 3. The attempt at a solution I started by saying the cross product of external B with B component of the radiation are perpendicular (i.e. 90°) and because of this the radiation will be circular polarised. But this answer seems to be very simple..