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Schematic representation of field lines of electric field around a negative electric charge.

A static electric charge (grey small circle at the centre) generates electrostatic field (blue area). 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. A charge moving at a constant velocity v generates electric and magnetic field attached with the charge (green area).

This drawing is based on: E.M. Purcell, D.J. Morin, Electricity and magnetism, 3rd edition, Cambridge University Press, 2013, ISBN 9781107014022

See also a drawing for deceleration of a charge:


You are permitted and indeed encouraged to use this image freely, for any legal purpose including commercial, and with any modifications (the permission is hereby given, so there is no need to ask for it explicitly again), but you MUST always give the following credits:

S. Zurek, Encyclopedia Magnetica, CC-BY-4.0

We would appreciate if you let us know of any use:

file/electromagnetic_field_magnetica_png.txt ยท Last modified: 2021/04/03 00:58 (external edit)

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