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Re: Science fiction or a wrong model again.



I thought the best superconductor was a vacuum (no crit. B, etc.) does have
focussing problems tho.

bc


Chuck Britton wrote:

At 1:17 PM -0700 on 1/8/02, Ludwik Kowalski wrote
Jack wrote:

Consider the most
simple circuit loop: a long wire and a
source of emf, such as the secondary
winding of a transformer. The potential
energy gained in the source is used to
accelerate free electrons between collisions
with bound atoms of the wire. It is then
thermalized. But suppose that the entire
loop is made from a semiconducting wire.

probably meant SUPERconductor

In my naive model electrons would no longer
collide with atoms. They would circulate
the loop with a constant speed if the primary
of the transformer was off. Right or wrong?

yep, whether it's electrons OR holes, they will drift without friction.


But with the transformer is working. Therefore
electrons should gain kinetic energy when the
emf is positive and loose it when it is
negative. In other words they can be accelerated,
like in a betatron. At f=100 Hz electrons are
strongly accelerated for two or three ms during
each cycle. That is sufficient to make a very
large number of round trips. Where am I wrong
this time?

Known superconductors ALL have a critical current AND a
critical magnetic field.
Exceeding either of these limits ruins the superconducting state.

DEFINITELY a good idea for sci. fi.

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