[Jewelry making - Article 00333] - Re: [Orchid] MRI for metal workers

[Brian Symons]

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    A further comment about metals being magnetically attracted or not.
    Whilst metals like copper silver & gold can't be picked up by a
    STEADY magnetic field, if the magnetic field is fluctuating then it
    will induce an electric current in any conductive material. An
    electric field has an associated magnetic field to it so this can be
    attracted. 

    There are huge electromagnets that use this effect to pick up scrap
    aluminium, copper etc. In fact a simple version used for a science
    trick is a normal electromagnet with a copper or brass washer on the
    end. When the electromagnet is fed DC like normally done then it
    picks up ferrous items, but when fed AC then it acts as a
    transformer, induces the electric current in conductive materials &
    will pick up copper, silver, aluminium etc. If the conductive ring
    is hidden then it sure causes people to stare. 

    MRIs use huge magnetic fields so just the turning on & off of the
    field can cause the induced voltage effects. 

Regards,
Brian.
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