Modern macroscopic electromagnetism employs four differential equations containing four vector fields, a source charge density, and a source current density. Two of the four fields (i.e., Ẽ (x, t) and B̃ (x, t)) are primitive fields, while the remaining two (i.e., D̃ (x, t) and H̃ (x, t)) are induction fields. Unlike the primitive fields, the induction fields do not have microscopic existence and ...