sci.physics.electromag

On Apr 4, 4:25=EF=BF=BDpm, j...@specsol.spam.sux.com wrote:
> Paul wrote:
> > On Apr 4, 10:14?am, 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, conductivi=
ty
> > > > 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.
> > =EF=BF=BD =EF=BF=BD =EF=BF=BD =EF=BF=BD =EF=BF=BDAre you saying that the=
magnetic field will not
> > be distorted due to a non-magnetic, but conducting cage?
> > =EF=BF=BD =EF=BF=BD =EF=BF=BD =EF=BF=BD =EF=BF=BDBoth the compass and th=
e cage will move within the
> > field.
>
> Moving a conductor in a magnetic field will induce current, called
> eddy currents, in the conductor, which in turn cause magnetic
> fields.
>
> The magnitude of those induced fields will be proportional to the
> magnitude of the external field and the velocity of the conductor.
>
> Unless the external magnetic field is a lot greater than the Earth's
> and the conductor is moving really fast and is really close to the
> compass, you are unlikely to see any effect.
>
> However, accelerating or turning a compass will cause compass errors
> all by itself. I'm assuming an ordinary mechanical compass here.
>
> --
> Jim Pennino
>
> Remove .spam.sux to reply.- Hide quoted text -
>
> - Show quoted text -

This will be a digital compass, with MEMS
accelerometers.

Are you saying that the magnetic field will
not be distorted due to a non-magnetic, but
conducting cage? As if the cage wasn't there?