Maxwell introduced the displacement current as a correction to

Ampere's law

Explanation:

the Ampere's law

when you curl your right hand around the american loop ,with the fingers pointing in the direction of integration.A current through the loop in  general direction of your outstretched thumb is assigned a plus sign , and a current generally in the opposite direction is assigned a negative sign

In electromagnetism, displacement current is a quantity that can be found  in Maxwell's equations .It is the rate of change of electric displacement field. Displacement current has the units of electric current density, and it has an associated magnetic field just as actual currents do.

unit of displacement current is in meter.

since magnetic fields have always been associated with currents, Maxwell proposed that this current was proportional to the rate of change of the electric field and called it displacement current.

Ampere Law

Explanation:

Maxwell designed both the displacement current law and the ampere law.

The ampere law states that for halted loop path, the total sum of elements multiplies by the magnetic forces in the direction of the element is directly proportional to the previous electric current halted in the loop.

However, Maxwell notices a lapse in the ampere law due to the nature of movement of the electric forces and decided to include the principle of time change or time difference in the system.

It is based on this new found nature of movement of the electric fores that Maxwell introduced the displacement current calculation.