sci.physics.electromag

Benj wrote:
> On Apr 3, 9:25 pm, j...@specsol.spam.sux.com wrote:

> > A non-magnetic cage around a compass will have no effect, conductivity
> > isn't the issue for static magnetic fields.

> What Jim means it a conductive enclosure (provided it isn't TOO
> conductive) won't effect the static readings of the compass. (a
> superconducting enclosure would block magnetic fields) On the other
> hand the conductive enclosure could affect the speed of response of
> the compass due to eddy current effects as the magnetic field is
> changed or the device moved in that field. How much it affects the
> the response depends on the details of the construction, of course.

With real world materials the eddy current damping effects are going
to be tiny to insignificant unless the cage walls are extremely close
to the compass.


--
Jim Pennino

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