K7ITM wrote:

With regard to "James Maxwell is usually credited with connecting
the two; his equations show that a time-varying conduction current
gives rise to a displacement current, and vice-versa," need it be
time-varying? I haven't given this a lot of thought in the past, but
it appears to me that the laws cover the case of a constant current as
well. If I'm not mistaken, which I could well be in this case, it's a
time-varying electric field that "looks like" a current, and an
electric field whose time derivative is constant "looks like" a
constant current, at least with respect to the magnetic field to which
it gives rise.

I'll be glad to defer to you on this. But it's important to see that the
static field produced by a constant conduction current won't induce a
conduction current in another conductor. So there's no static equivalent
of what happens in a capacitor, which behaves as though the charge
seemingly flows through the dielectric.

Roy Lewallen, W7EL