What is the theory of quantum electrodynamics?

quantum electrodynamics (QED), quantum field theory of the interactions of charged particles with the electromagnetic field. It describes mathematically not only all interactions of light with matter but also those of charged particles with one another.

What is the Maxwell third equation of electrodynamics?

Maxwell’s 3rd equation is derived from Faraday’s laws of Electromagnetic Induction. It states that “Whenever there are n-turns of conducting coil in a closed path which is placed in a time-varying magnetic field, an alternating electromotive force gets induced in each and every coil.” This is given by Lenz’s law.

How do Maxwell’s equations predict the speed of light?

In particular, his equations predicted that electromagnetic waves propagate at the speed of light c=3×108m/sec, establishing that light was in fact a form of electromagnetic radiation. This is evident from the fact that Maxwell’s equations predicted the speed of light.

What does Maxwell’s second equation signify?

The second Maxwell equation is the analogous one for the magnetic field, which has no sources or sinks (no magnetic monopoles, the field lines just flow around in closed curves). Therefore the net flux out of the enclosed volume is zero, Maxwell’s second equation: ∫→B⋅d→A=0.

What is electrodynamics used for?

electrodynamics, study of phenomena associated with charged bodies in motion and varying electric and magnetic fields (see charge; electricity); since a moving charge produces a magnetic field, electrodynamics is concerned with effects such as magnetism, electromagnetic radiation, and electromagnetic induction.

What does Maxwell’s theory say about the speed of light?

From these equations, Maxwell postulated that light can be thought of as an electromagnetic wave since the electric and magnetic fields solve the wave equation with a phase velocity of c. This theoretical value of the phase velocity of light waves is exactly 299,792,458ms.