# How electric field and magnetic field propagate through vacuum where there's no charge present? [duplicate]

As we know light travels as an electromagnetic wave...but electric fields and magnetic fields are interactions between charges...they are the forces acting on stationary and moving charges respectively. But when there is no charge how can these fields propagate through free space??

## marked as duplicate by John Rennie electromagnetism StackExchange.ready(function() { if (StackExchange.options.isMobile) return; $('.dupe-hammer-message-hover:not(.hover-bound)').each(function() { var$hover = $(this).addClass('hover-bound'),$msg = $hover.siblings('.dupe-hammer-message');$hover.hover( function() { $hover.showInfoMessage('', { messageElement:$msg.clone().show(), transient: false, position: { my: 'bottom left', at: 'top center', offsetTop: -7 }, dismissable: false, relativeToBody: true }); }, function() { StackExchange.helpers.removeMessages(); } ); }); }); Aug 5 at 16:32

• The electromagnetic field does not “need” charged particles to exist, any more than charged particles need an electromagnetic field to exist. It is easy to imagine a universe in which the electromagnetic field exists but fields for charged particles do not. Such a universe would not be very interesting (you would just have free photons flying around, not interacting with anything), but it would not be inconsistent. So I think you just have the wrong conception of the electromagnetic field. Electrodynamics is the story of how the electromagnetic field and charged particles interact. – G. Smith Aug 5 at 16:38