→The displacement current has the same physical effect(s) as the conduction current.
→In some cases, for example steady electric fields in a conducting wire, the displacement current will be zero, since the electric field E does not change with time.
→In other cases, for example the charging capacitor above, both conduction and displacement currents may be present in different regions of space.
→In most of the cases, they both may be present in the same region of space, as there exists no perfectly conducting or perfectly insulating medium.
→Most interesting, there may be large regions of space where there is no conduction current, but there is only a displacement current due to time-varying electric fields. In such a region,we expect a magnetic field, through there is no (conduction) current source nearby.
→For example, a magnetic field at a point between the plates of a capacitor is seen to be the same as field at a point just outside the capacitor plates.