sci.physics.electromag

On Mar 3, 6:05 am, "Bill Miller"
wrote:
> "Benj" wrote in message
>
> news:9a395157-13fb-475c-8249-28eb779a3abc@i7g2000prf.googlegroups.com...
>
> > On Mar 1, 12:26 pm, Uncle Al wrote:
>
> >>http://www.mazepath.com/uncleal/lilies.htm
> >>http://www.mazepath.com/uncleal/field.htm
>
> > So I'm reading Unc's stories about "brain-sucking" NMR magnets and
> > that brought to mind some previous musings of mine.
>
> > Most of you here are into physical sciences but if for some reason you
> > would go to medical school, one of the classes you'd take would be
> > physiology and one of the experiments you'd do would be to cut open
> > some dogs and play with their hearts.
>
> > What you'd discover is that with voltages in the millivolt level a
> > wire touched to the outside of a beating heart (depending on the
> > electrical signal) can send it in to sudden arrhythmia (Known as
> > fibrillation...so called because it was originally believed that each
> > heart fiber was beating independently) or with a quick DC pulse send
> > it back into normal rhythm. Remember I said millivolts!
>
> > Now as you probably know from TV when the heart goes into such
> > arrhythmia emergency people use a device called a "defibrillator" It
> > is essentially a huge capacitor with a couple paddle electrodes
> > designed to send JOULES of energy through a patient's chest. Now the
> > reason for all this voltage and energy is that the heart is more or
> > less isolated from the rest of the body and is electrically isolated
> > even more by being covered with the pericardium sack. So much energy
> > and voltage is needed to defibrillate the heart that the machine often
> > burns the patient's tissue.
>
> > Well, crap, I've thought from time to time, I've seen with my own eyes
> > that all you need is MILLIVOLTS to do the job, so why in hell can't
> > one simply use a pulsed magnetic field as a defibrillator? One
> > additional piece of data came to me when I had an MRI scan. I thought,
> > hey, there is a really nice intense field there pulsing away, that
> > should surely induce some hum or noise in the nerves in my head or
> > ears! If it did, that surely would be evidence that one could build
> > an inductive defibrillator! Well, no soap. Lots of noise alright,
> > but as Uncle Al notes it was from the vibrations of the heavy current
> > coils and not my insensitive brain!
>
> > So how about it? Why won't a pulsed magnetic field induce nervous
> > firings? Why won't a pulsed magnetic field make your hand twitch? I've
> > heard that the Gummint has secret devices that can create voices in a
> > persons head (probably lots of victims here on usenet!) but that they
> > use microwaves rather than magnetic fields to do the job.
>
> > So why is it that one cannot build a magnetic defibrillator? Why won't
> > pulsed magnetic fields that SHOULD be creating voltages high enough to
> > do the job have any effect? What am I missing here?
>
> Hi Benj...
>
> Re-read Jefimenko. Then repeat after me:
>
> An electric field cannot cause a magnetic field.
> and
> A magnetic field cannot cause an electric field.
>
> Neat demonstration of the above, isn't it?

The only thing being demonstrated is ignorance. Nothing Jefimenko says
can undo basic observation.

>
> Bill