Re: Electron at rest - magnetic field?

John Kennaugh:
>Rod Ryker wrote:
>>
>>
>>Bill Hobba <rubbish@xxxxxxxx> wrote in message
>>news:0030f.5663$U51.1063@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>>
>>> "Rod Ryker" <rryker@xxxxxxxx> wrote in message
>>> news:2052f$43408df0$d8442672$11598@xxxxxxxxxxx
>>> >
>>> >
>>> > Bill Hobba <rubbish@xxxxxxxx> wrote in message
>>> > news:RE_%e.5446$U51.2993@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>> >>
>>> >> "Rod Ryker" <rryker@xxxxxxxx> wrote in message
>>> >> news:8a3f9$433f0bd5$d8442809$22074@xxxxxxxxxxx
>>> >> > Long ago Faraday proved, not caring at the time,
>>> >> > that electrons at rest have a magnetic field.
>>> >>
>>> >> Since that in not what Faraday proved it is you who speaks with forked
>>> >> tongue.
>>> >>
>>> >> Bill
>>> >>
>>> >
>>> > Rod: Read up on Faraday's Cage, Bill.
>>>
>>> I have - you obviously have not since it does not show electrons at rest
>>> have a magnetic field - even assuming one can give a specific velocity to
>>a
>>> quantum object.
>>>
>>> Bill
>>>
>>
>>Rod: The Cage was steel.
>
>Is it? I am under the impression that a Faraday cage can be made of any
>conductor - but hey what do I know I'm only an electronics engineer.

The better the conductor, the better the faraday cage. For that
reason, most faraday cages are made from copper. Silver would be better,
but silver is too expensive and would need to be gold plated, since
silver corrodes quickly (which is why the silver surfaces inside wave
guides are flashed with gold, which is not as good a conductor as copper,
but can be plated onto surfaces in a very thin layer.) I have a hard
time seeing why anyone would make a faraday cage out of steel unless
they had a bunch of steel lying around.


>>Steel is a magnetic material.
>
>Iron is a magnetic material. Steel isn't necessarily so. Stainless steel
>is non magnetic despite its high Iron content.
>
>>Magnetic Fields can't pass
>>through magnetic materials.
>
>If you put a bar magnet inside a 'tin' made of iron you can detect its
>presence with a compass. What a magnetic shield does is to concentrate
>the lines of force within itself so that less (not none) appear outside.
>The thicker the magnetic material, the wider the magnetic path the less
>will be detected on the other side.
>
>>Hence, electrons can't pass
>>through a magnetic material.
>
>electrons can't pass through a lot of non magnetic materials - so
>whether the material is magnetic or not would not appear to be the
>critical factor.

Electrons, like any other particle, can pass through anything if
the energy of the electrons is large enough.


.

Relevant Pages

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