Re: First Law (now perpetual motion)

[Ludwik Kowalski <KowalskiL@MAIL.MONTCLAIR.EDU>]

Herbert H Gottlieb wrote:

> Similarly, if a small section of a wire is stretched from wintip to
> wingtip of an airplane and the rest of the wire is covered by magnetic
> shielding, we should have the changing flux through the loop that you
> say is necessary.

This is not clear. Consider a wire in terrestrial field. You shield it
with a thick mu-metal cylinder. The field lines do not disappear, they
just "prefer to travel" through the shield. Are you thinking about a
shield which is a half-pipe over one section of your loop?