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Aluminum Interactions with Magnets

A magnetic resonance imaging (MRI) machine uses an enormous and extremely strong magnet to study a patient's body.  The magnet, which has its north pole at the patient's head and its south pole at the patient's feet, is actually a coil of superconducting wire through which electric charges flow.

(a)        The needle of your magnetic compass has its north magnetic pole painted red and its south pole painted white.  It you stand a few meters from the MRI machine, at the end where the patient's head is, why does the white end of the compass turn toward the patient's head?
Because the magnet of the machine has its north pole there and it attracts the opposite pole, which is the south pole of the compass.


(b)      (d)    Aluminum isn't normally magnetic, but as you carry a large aluminum tray toward the magnet, you find that the magnet repels the aluminum.  Explain.
Once again, Lenz's law.  The magnet induces a magnetic field in the moving aluminum tray to oppose its own, effectively pushing it away.

(c)      (e)    You eventually manage to get the aluminum tray up to the magnet.  As long as the tray doesn't move, it experiences no magnetic forces.  But when you drop it, it falls past the magnet remarkably slowly.  What slows down its fall?
That trickster, Lenz.  When the tray is stationary, the magnetic field of the magnet is not changing, but as soon as it moves, the field begins changing and an opposing field is induced.

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http://groups.yahoo.com/group/pes_mxlo/message/168

From:  "Darrell Jacobson" <darrellj@burgoyne.com>
Date:  Sun Mar 7, 2004  9:43 am
Subject:  Re: [pes_mxlo] Some Info about Aluminium and magnetic Poles

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http://groups.yahoo.com/group/pes_mxlo/message/169

From:  "Mark" <mwiseman1@cox.net>
Date:  Sun Mar 7, 2004  10:38 am
Subject:  [pes_mxlo] Some Info about Aluminium and magnetic Poles

In fact, all diamagnetic materials are affected by Lenz’ law. I've experimented with Magnesium and Be, they do the same even though they are lightweight metals. No metals are neutral to magnetism. Even non-metals exhibit a reaction. I've seen frogs suspended by supermagnets, the frogs' life seemed unaffected.

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http://groups.yahoo.com/group/pes_mxlo/message/175

From:  Ron Viellieux <vayoutech@juno.com>
Date:  Sun Mar 7, 2004  8:09 pm
Subject:  Re: [pes_mxlo] Some Info about Aluminium and magnetic Poles

Copper and Al effects with magnets, this is due to Eddy Currents or Eddy Field that sets up with either a spinning disk or dropping magnet thru copper tube.  The Eddy creates a resistance to gravity and effects or slows down the magnet in a copper tube.

Amusement rides, the ones that shoot you up in the air and drop you real fast then stop you, they use magnet copper Eddy effect as a magnetic braking system.

Similar technology used in Mag-Lev trains for propulsion.

Regards,

Ron

http://groups.yahoo.com/group/pes_mxlo/message/176

From:  Mikael Bi <qtx_2000@yahoo.fr>
Date:  Sun Mar 7, 2004  1:37 pm
Subject:  Re: [pes_mxlo] Some Info about Aluminium and magnetic Poles

Do you think  the present concept with diode at the extremity  of collector coil, so  it is eddy current who make electron flow, as diode at the extremity block Back EMF,  voltage but only few milliamps?

Lenz Law and Imbalance

Well, Yes, the aluminum creates 'part of' the imbalance  with lenz
law to keep this thing going. Eben if it appears this will slow it
down, it will also imbalance the fields.
Good luck.

Ken

Sliding Neo down Aluminum strip

See also

• Theory

Index created by SDA March 7, 2004
Last updated March 14, 2004 04:30:59 PM MST

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