Question

Mention the need for displacement current

Answer 1

In electromagnetism, displacement current is the quantity appearing in Maxwel's Equation that is defined in  term of the rate of change of elctric displacement field. Displacement current has the same unit as electric current. and it is the source of a magnetic field just as actual current is. However it is not an electric current of moving charges. but a time varying electric field.

Answer 2

Displacement current refers to the current that occurs because of the changes that occur in the electric field and electric flux over a period of time. This current can flow in vacuum. There are two primary reasons when displacement current is useful:

 

* To produce a magnetic field in the area between the two plates of a conductor

* To account for the inconsistency of Ampere’s law.