"John C. Polasek" <jpolasek@[EMAIL PROTECTED]
> wrote in message
news:4g0l64p0qplifdsjh9eusjvbgja1kdgtvq@[EMAIL PROTECTED]
> On Tue, 01 Jul 2008 17:28:17 GMT, "Bill Miller"
> <billmillerkt4ye@[EMAIL PROTECTED]
> wrote:
>
>>
>>"John C. Polasek" <jpolasek@[EMAIL PROTECTED]
> wrote in message
>>news:olsi64dpq3djae7k2p3qk1nb92ja7da625@[EMAIL PROTECTED]
> ruthless snip
>>>>
>>>>Even in introductory texts, it wouldn't be terribly difficult to say
>>>>something like, "Maxwell's equations demonstrate a clear relation****p
>>>>between Electric(E) and Magnetic (H) fields. This is sometimes
>>>>erroneously
>>>>interpreted as meaning that E causes H and H causes E. However, a
>>>>careful
>>>>analysis shows that E fields and H fields are sololy caused by charges
>>>>and
>>>>the movement of charges.""
>>>>
>>>>Not too hard.
>>> You are full of beans.
>>
>>Yep... Had some last night.
>>
>>As soon as the currents pulse up and down in
>>> the antenna, a good ****tion of the energy exits as EM waves that take
>>> off across the country. They're on their own and don't need overt
>>> charges or currents. E, D, B and H are taken care of by polarization
>>> of eps0 and mu0, properties of the vacuum. They exchange energies as
>>> they go along.
>>
>>Your case would be stronger if E and H (in an EM wave) were out of
phase.
>>Then we would have a situation analagous to -- say -- a spring or water
>>waves, wherein kinetic energy gets swapped for potential energy, etc.
>>
>>BUT E and H are in phase! How in the world can anyone imagine that two
in
>>phase and contiguaous signals are *swapping* energy? If you can do so, I
>>believe we would all love to hear how it works.
>
> OK, here's how they swap energy, (and remember, you promised to love
> to hear this).
> Using spring mass for simplicity
I just dropped everything, rushed outside and looked at my antennas. No
matter how hard I looked, I couldn't find a spring.
>and recognizing that the wave will be
> sinusoidal, the force on the spring is pro****tional to displacement
> Fk = F0 sin wt (say)
> The force on the mass is pro****tional to acceleration, two derivatives
> removed, so it's 180 degrees out of phase.
> Fm = - w^2F0 sin wt
> The energies likewise peak 180 degrees apart.
>
I'm sorry, John. I still don' see no spring!
And while Saint Albert (and the bomb) taught us that Energy and Mass have
equivalency, I do not see where mass enters into this situation.
Are you perhaps suggesting that the free space epsilon exhibits the same
type of spring-like latency that we see in the epsilon of many solid
dielectrics? If so, then, yes, we see a phase ****ft.
But I am not aware of any such phase ****ft that has bee measured in free
space. If this is your suggestion, then show us the free space
experimental
evidence, please.
> So you were approximately correct, that they are in phase, yes, in a
> larger sense. After all, what's a minus sign? Well, shucks, let's just
> admit that they are out of phase, as you were opining, making my case
> stronger as you point out. I'm gratified.
>
>>THEN stand by your phone for the Stockholm call!
>>
>>> Your assumption of currents and charges being present and essential is
>>> just as valid as the teams now looking for Wimps and Machos to explain
>>> the dark matter problem.
>>
>>Currents and charges are essential to LAUNCH the wave(s). Afterwards,
the
>>separate E and H signals are in lock step and isolated.
>>
>>> By the way which do you prefer:
>>> D = E and B = H
>>> or D = eps0E and B = mu0H ?
>>
>>I pick....
>>
>>Let's see...
>>
>>Door number... Ummm...Well...
>>
>>Oh gosh, I just can't decide!
>
> You dodged the D=E bullet. That's a sure sign of a benighted cgs'er
> who at least has the decency to feel a little guilty.
OK You caught me! I choose...
British Thermal Units and Furlongs Per Fortnight
Bill
>
>>>>Bill
>
>
>>>>> Timo Nieminen - Home page:
>>>>> http://www.physics.uq.edu.au/people/nieminen/
>>>>> E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
>>>>> Shrine to Spirits:
>>>>> http://www.users.bigpond.com/timo_nieminen/spirits.html
>
> John Polasek
|
