[Physicist]

We're simply trying to answer *how fast* the field gets there

If it didn't get there at the speed of light, radar wouldn't work.

[Southack]

"If it didn't get there at the speed of light, radar wouldn't work."

I don't see where you dug that statement up. I'm not arguing about the speed of *disturbances* in an existing electromagnetic field, but rather how fast a magnetic field covers an area.

[Old Professer]

If I may suspend levity for a moment; how would one show an acceleration greater than c?