Displacement current density
Physical quantity in electromagnetism
Displacement current density
In electromagnetism, displacement current density is the rate of change of the electric displacement field D, appearing as ∂D/∂t in Maxwell's equations. Displacement current density has the same units as electric current density, and it is a source of the magnetic field just as actual current is. However it is not an electric current of moving charges, but a time-varying electric field. In physical materials (as opposed to vacuum), there is also a contribution from the slight motion of charges bound in atoms, called dielectric polarization. The idea was conceived by James Clerk Maxwell in his 1861 paper "On Physical Lines of Force" (Part III) in connection with the displacement of electric particles in a dielectric medium. Maxwell added displacement current to the electric current term in Ampère's circuital law. In his 1865 paper A Dynamical Theory of the Electromagnetic Field Maxwell used this amended version of Ampère's circuital law to derive the electromagnetic wave equation. This...
Read on Wikipedia · Image Geek3, CC BY-SA 3.0
Open boosters, collect cards and trade them. Free to play.
Play for free