Diagram illustrating generation of
electromagnetic field by an
electric charge: a static charge (grey small circle at the centre) generates
electrostatic field (blue area) which statically extends away into space. A sudden acceleration of the charge (dark blue small circle) creates an electromagnetic pulse (red ring) which
radiates away into space at the
speed of light, and the space far away still contains the electrostatic field from the time when the charge was stationary (as indicated by grey lines). A charge moving at a constant velocity
v generates electric and magnetic field attached with the charge (green area). The
field lines (black lines) show the direction and intensity of electric field.