Re: superconducting LC tank circuit?

srp@xxxxxxxxxxxx wrote:
On 1 mar, 10:35, j...@xxxxxxxxxxxxxxxxxxxx wrote:

<snip old crap>

An LC circuit is a LC circuit no matter the physical size or arrangement
of the inductor and capacitor.

Disagreement. An isolated LC system is stand alone, not in the same
situation as one inducing energy into any surrounding other circuits.

An LC circuit is a LC circuit no matter what the construction material.

Again, an isolated LC system is not in the same circumstance as
one being tapped by an associated circuit.

Nothing has been said about any "associated circuit" or being "tapped"
by anything.

Take an inductor and a capacitor and place them in parallel and you
have a LC tank circuit.

It doesn't matter what the parts are made of, their physical size, or
arrangement, it is still a LC tank circuit.

Put this circuit in your kitchen or in intersteller space a 100 light
years from the nearest object and it is still a LC tank circuit.

Hit the LC circuit with an impulse and it will ring at a frequency
of f = 1 / ( 2 x pi x sqrt ( L x C) ).

Remove the apparatus used to provide the impulse so the LC tank circuit
is now totally isolated.

The initial amplitude of the ringing will depend on how much energy
you dumped in with the impulse.

As time passes, the amplitude of the ringing will decrease as energy
is lost.

If the LC circuit is constructed with normal materials, most of the
loss will be due to resistive loss in the materials and I^R heating.

If the LC circuit is constructed with true supercondutors and a
lossless dielectric for the capacitor, there will be no resistive
loss of energy because there is no resistance.

Any conductor with AC current generates an electromagnetic field
at the frequency of the current.

The tank circuit has conductors which are the inductor itself,
the connections from the inductor to the capacitor, and the
capacitor plates.

In most LC circuits the conductor which forms the inductor is
physically the largest, but that is irrelevant to the arguement.

Since the LC circuit itself contains inductors carrying an AC
current, the LC tank circuit generates an electromagnetic field.

The amplitude of the generated field is directly related to the
physical size of the conductor measured in wavelengths of the
current frequency.

Electromagnetic fields propagate away into space.

Electromagnetic fields contain energy.

Therefor, energy is lost from the LC tank circuit through the
electromagnetic field.

Depending on the initial amplitude of the ringing, the amount of
energy being propagated, and the resolution of any measuring
equipment, it may take some time to be able to measure the loss.

That time may be seconds, minutes, or years.

<snip rest>

--
Jim Pennino

Remove .spam.sux to reply.
.

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