Re: Inertial-dampening systems

From: Franz Heymann (notfranz.heymann_at_btopenworld.com)
Date: 02/09/05 

Date: Wed, 9 Feb 2005 07:56:52 +0000 (UTC)

<msadkins04@yahoo.com> wrote in message
news:1107814751.492551.78350@f14g2000cwb.googlegroups.com...
>
> Gregory L. Hansen wrote:
> > In article
<1107743305.741695.255450@c13g2000cwb.googlegroups.com>,

[snip]

> > I've just done that. A spool of wire (I don't know how many >
turns)
> connected to a function generator (Stanford Research
> > Systems DS345) with a 10 ohm resistor in series, and a
> > scope (Tektronics 2445B) across the resistor to monitor the
> > current. And a one turn secondary with a 10 ohm series
> > resistor, and a second channel on the scope across that
> > resistor. I put a square wave on the primary, and damned
> > if the secondary didn't spike every time the primary changed
> > state. I put a sawtooth wave on the primary, and found a
> > square wave on the secondary with an amplitude that
> > increases with the frequency of the sawtooth on the primary.
>
> Of course you did. Do you know why? Because you created a completed
> circuit consisting of: the first part of the wire, the resistor in
> series with it, the lead of your scope coming off the far side of
the
> resistor, the scope innards, and the other scope lead connected to
the
> near side of the resistor. You created a grounded, completed
circuit,
> and lo and behold, the magnetic pulse induced an electric current.
But
> only through that circuit. There was no current flow through the
rest
> of that wire, of course. And if there had been no resistor and no
> scope, but just a piece of wire, why on earth would you claim to
think
> that current would flow down its length? Electric current requires
two
> things: (1) a path; (2) an electromotive potential difference. A
> straight length of isolated wire provides neither. A closed loop of
> isolated wire provides neither. There is no current flow there.
> (Another possibility is direct induction on your scope, but I tend
to
> discount that.)

Gregory described a simple but well executed experiment and he
analysed it correctly.
I take it that you, Marl, are still at school and have only recently
started learning about E&M. Your post indicates that you still have a
long way to go. It might save you some future embarrassment if you
were to go at least part of that way before commenting any more.

[snip]

Franz

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