If a charge moving at constant velocity doesn't produce EM waves, how does it create an EM field in a point in space if the charge and the point can communicate only via EM waves?

Question

If a charge moving at constant velocity doesn&#039;t produce EM waves, how does it create an EM field in a point in space if the charge and the point can communicate only via EM waves?

kuglatid4 · Accepted Answer

If a charge is moving at constant velocity for inertial frame       A    A  , it is always possible to make a change of coordinates, applying Lorentz transformation, to the inertial frame of the particle, say       B    A  .For frame       B    A  , the field is static all over the space. And frame       A    A   is moving around this static field. So, there is no signal or information to be transmitted.Of course we can think that the charge was not always there. At some moment a device separated positive and negative charges, and surely some acceleration was involved. EM waves were emitted then, sending the information through the space.