Answer:
Ampere's law
Step-by-step 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.