Maxwell’s displacement current
Maxwell generalised Ampere’s law to
∫B.dl = µ0(i + id)
id = ε0*(d ΦE/dt)
ΦE/ = the flux of the electric field through the area bounded by the closed curve along which the circulation of B is calculated.
Maxwell termed id as displacement current
Gauss’s laws for electricity and magnetism, Faraday’s law and Ampere’s are collectively known as Maxwell’s equations