Originally Posted By: Paul
The rotating magnetic field (of the inner core)

which is not an electromagnetic field

A little clarification may be needed here. In fact all magnetic and electric fields are part of an electromagnetic field. They do not exist in isolation. We frequently speak of a magnetic field or an electric field as if it was an independent item. However, that is just a matter of how we are looking at them. Here is the Wikipedia article It has a fairly good explanation of just how the electromagnetic field works.

And with that small correction I think you have pretty good grasp of the situation.

Bill Gill

C is not the speed of light in a vacuum.
C is the universal speed limit.