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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