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[Amps] Voodoo Magnetic Fields

To: <amps@contesting.com>
Subject: [Amps] Voodoo Magnetic Fields
From: garyschafer at attbi.com (Gary Schafer)
Date: Sat Feb 8 21:29:25 2003

Ian White, G3SEK wrote:
> WT8R wrote:
> 
>> In a message dated 2/7/03 7:19:57 PM Eastern Standard Time,
>>
>> Eric,
>>       You can speculate all you want and by plugging numbers into 
>> formula,
>> get almost any number you want by making assumptions.  Lets look at 
>> the real
>> world of results.
>>
>>       I worked in a basic research labortory where we used a pulsed
>> solenoidal DC magnet which generated such a strong field that it had 
>> to be
>> cooled by liquid nitrogen before it was activated so that it would not
>> destroy itself.  The conductors carrying current to the magnet had to be
>> restrained by heavy wooden boards to prevent them from moving.  The field
>> outside the magnet was so strong that it picked up a pair of scissors 
>> which
>> were inadvertantly left laying on a work bench 10 feet away and buried 
>> them
>> in the wooden shroud surrounding the magnet.  The scissors ended up on a
>> radius of the axis of the magnet.
>>       No small force here.
> 
> 
>  From the evidence of the scissors, the cables were in a very large 
> stray field, so you could expect the force to be greater. Ye cannae 
> escape the laws o' physics!
> 

One of the big fears when MRI machines are operating is that someone 
forgets and leaves a pen in his pocket.

73
Gary  K4FMX


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