OT magnetic car key holders

OT Is there a difference between a magnetic car key holders whose box portion is made of sheet metal, versus one made of plastic?

That is, the magnet is the same. Will a metal container portion increase the effective strength of the magnet?

Reply to
micky
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it could be however.,.. one scenario I can think of and it may have nothing at all to do with it.. Key fobs have sensitive electronics and programmable keys could be sensitive to magnets ?

Using a metal container would act like using Mu metal, the magnetic field (flux) could bend towards the case and not have a high reluctance to the field. High reluctance would mean the field would be allowed to permeate through your keys.. That's just a guess of course. it could be just marketing:)

Jamie

Reply to
Maynard A. Philbrook Jr.

Both use a U shaped piece of steel with a magnet inside the U. That means that the magnetic field is almost entirely between the poles of the U. You can confirm this by trying to attach some piece of metal to the back end of the U, where the plastic or metal can is attached. It won't stick, meaning there's no magnetic field. Therefore, the can be made of either magnetic or non-magnetic material without affecting the field between the poles on the opposite side.

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Jeff Liebermann     jeffl@cruzio.com 
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Reply to
Jeff Liebermann

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