The author uses the two interchangeably -- which they are not..... Electromagnetic radiation -- the phenomenon -- is much, much more than just the "magnetic field."
(The author; uses interchangeably; the two) (they; are not; Electromagnetic radiation) (they are not..... Electromagnetic radiation; is; much, much more than just the "magnetic field)
The author they they are not..... Electromagnetic radiation
uses interchangeably are not is
the two
Electromagnetic radiation
much, much more than just the "magnetic field