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From: mstem...@walkabout.empros.com (Michael Stemper)
Newsgroups: alt.tv.star-trek.tos,rec.arts.sf.tv,rec.arts.sf.written,rec.arts.tv,sci.physics
Subject: Re: Warp Drive May Be More Feasible Than Thought, Scientists Say
Date: Tue, 30 Oct 2012 14:14:28 +0000 (UTC)
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In article <6FMjs.15053$2Q3.5...@newsfe25.iad>, "Danie...@teranews.com" <d...@albury.nospam.net.au> writes:
>Michael Stemper wrote:
>> In article <RqRis.19980$6S6.18...@newsfe12.iad>, "Danie...@teranews.com" <d...@albury.nospam.net.au> writes:
>>> Wayne Throop wrote:
>>>> : "Danie...@teranews.com" <d...@albury.nospam.net.au>

>>>> Moving or changing magnetic fields cause an electric potential whether
>>>> there is metal or wire around or not.
>>
>>>> Therefore there's no such thing as a "magnetic waveform".
>>>> If it's a waveform, it's changing, and if it's changing,
>>>> it's an electromagnetic waveform.

>>> Where can I find Maxwell's equations that show the electric potential
>>> happens?? Seems I might need some private study notes!!
>>
>> I've already posted this link once in this thread, but since you didn't
>> bother to read it the first time, I'll give you a second chance.
>> <http://scienceworld.wolfram.com/physics/MaxwellEquations.html>
>>
>> Look at the second equation. It shows that at time-changing magnetic
>> field has an electric field associated with it.
>
>Hey, Michael, a few chicken scratchings didn't make much sense the first 
>time I looked at them!!

You asked for a link to them, so I posted it. You asked again, so I posted
it again. If you didn't understand them the first time, why did you ask for
another link? Why didn't you say something like "I don't know any math or
physics, so I didn't understand them"?

>Looking at them a second time still doesn't explain them!!

I'm feeling magnanimous today, so I'll walk through that second equation.

Let's start with the right-hand side. The letter "B" is used throughout
physics and electrical engineering to represent the magnetic field strength
and direction. (The fact that it's a vector is indicated by the use of
a bold font-face.)

The constant -1/c, where "c" is the speed of light in a vacuum, is used to
adjust for the fact that the equations are given here in the nasty cgs
form. If Weisstein had done these in SI, as God intended them to be
written, this term wouldn't need to be there.

So, all that we're left to explain is the things that look kind of like
a lower-case "d", and the "t". The notation "dB/dt" means "the derivative
of B with respect to time". In non-mathematical terms, how fast B is
changing.

So, the right-hand side boils down to a constant times the rate at which
the magnetic field is changing. If this is non-zero, that means that the
magnetic field *is* changing, which is the situation you were pretending
to be discussing.

Hold that thought while we move over to the left-hand side.

"E" is used throughout physics and electrical engineering to represent the
strength and direction of the electric field. (Again, a bold font face is
used to indicate that it's a vector.) The upside-down triangle followed
by the thing that looks like a capital "X" is a symbol for the "curl"
of a vector field. It describes how the shape of the field changes at
any point. Sort of.

Now comes the big leap of understanding. Watch carefully.

Do you agree that if the change in the shape of something isn't zero,
that its shape is changing?

Do you agree that if the shape of something is changing, it can't be
zero everywhere? If it's changing across space, it must have parts
that aren't zero?

Do you agree that if the right-hand side of an equation is non-zero, then
the left-hand side must also be non-zero?

Assuming that you've followed this, we can establish the following
chain of reasoning:
1. If a magnetic field is time-changing, the right-hand side of
   that equation is non-zero.
2. If the right-hand side of that equation is non-zero, the left-hand
   side of that equation is non-zero.
3. If the left-hand side of that equation is non-zero, then the
   electrical field's shape must vary across space.
4. If the electrical field's shape varies across space, then it
   must be non-zero.

Quod erat demonstrandum.

-- 
Michael F. Stemper
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Life's too important to take seriously.