sci.physics.electromag

On Mar 4, 10:56=A0am, "Bill Miller"
wrote:
> An electromagnet works because electrons are in motion; not because any
> causal relationship exists between an electric field and a magnetic field.=

>
> Such relationship cannot be causal because E fields and H fields exist
> simultaneously. The basic concept of causality is that A must precede B in=

> order for A to cause B.

O(E') and O(Ht) do, where O is in H(t) and E(t) in a shut sustem.