Hi Dave,
Magnets and coils behave quite differently when presented with impulse and alternating energisation events, especially resonant situations.
Simplistic static drawings no longer apply, and alternating magnetic fields are like electron orbit precessions, these not being either spatially linear, nor coherent throughout (ferrite) cores etc.
When two wires in the form of a dipole radiate electromagnetically in air (as Hertz did) or in free space, then the earth is neither necessary nor involved.
Bi-directionality ? For every action there is equal but opposite reaction, but that reaction comes from the components involved.
Magnets and coils behave quite differently when presented with impulse and alternating energisation events, especially resonant situations.
Simplistic static drawings no longer apply, and alternating magnetic fields are like electron orbit precessions, these not being either spatially linear, nor coherent throughout (ferrite) cores etc.
When two wires in the form of a dipole radiate electromagnetically in air (as Hertz did) or in free space, then the earth is neither necessary nor involved.
Bi-directionality ? For every action there is equal but opposite reaction, but that reaction comes from the components involved.
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