What is displacement current? Why was this concept introduced? Explain. Also obtain the Ampere - Maxwell equation.

The displacement current is a quantity in Maxwell's equation. It is defined in terms of the electric displacement field's rate of change.

The displacement current units are the same as the electric current density units. Displacement current is not an electric current caused by moving charges, but rather by a changing electric field over time.

When we look at a capacitive circuit, we can see that current is flowing through the circuit. However, if you look at the capacitor plates, you will notice that there is a small empty region between them.

To explain this effect, displacement current was introduced.

Ampere’s circuital law states that,