what is displacement current?
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displacement current density is the quantity ∂D/∂t appearing in Maxwell's equations that is defined in terms of the rate of change of D, the electric displacement field.
In electromagnetism, displacement current is a quantity appearing in Maxwell's equations that is defined in terms of the rate of change of electricdisplacement field. Displacement current has the units of electric current density, and it has an associatedmagnetic field just as actual currents do.