Re: Magnetism Project --> Need Help Please
- From: default
- Date: Wed, 04 Jan 2006 08:51:55 -0500
On Wed, 04 Jan 2006 00:17:43 -0600,
primeau121@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx (Primeau121) wrote:
>hey im a sophomore in high school and I need help with a project on
>affecting the strength of a magnetic field...... first of all my
>project is seeing how certain materials can affect the strength of a
>magnetic field, created by a bar magnet and a neodymium magnet. The
>field
>will be measured using a CBL extension sensor from a TI-83 Plus
>graphing calculator. the independent variable will be placed between
>the magnet and the sensor anywhere from 2-10 centimeters between each
>(placed in the middle). The problem is that I tested aluminum and
>it had no effect on the strength of a magnetic field. While this is
>obvious, my fear is that other metals fill not affect the strength
>and I will receive a failing grade. I need to know what metals may
>affect the magnetic field, or anything that will affect it, for that
>matter. Other metals will have an effect, but they may not be
>available to me (or I may not know it).
>
>
>If you haven't already observed so, I have little knowledge of a
>magnetic field and what may affect it. Any knowledge or insight you
>may possess that may be helpful would be greatly appreciated. Thank
>you for your time.
Plenty of information on line. You have a lot of reading to do.
You don't affect the strength of the magnetic field, you just change
its shape by interposing magnetic material between the magnet and your
sensor. Magnetic metals are permeable to the field and concentrate
the flux. (short circuit it away from the sensor)
Failing grade for finding pure aluminum to be non-magnetic? I
wouldn't worry too much about that. Your "affecting the strength"
hypothesis is flawed - but even if you were to prove a negative
correlation, why should that make for a failing grade? So long as the
science is right . . .
Search: permeability, magnetic, diamagnetic, flux, Oersteads, Tesla's,
etc.
Saw a neat experiment on line: a permanent magnetic levitation device
that requires no electrical power. The designer took a very powerful
magnet and suspended another between them using bismuth or graphite
(readily available materials with diamagnetic properties - they repel
magnets while not being magnetic themselves)
Commercial sites, but they give the principles
http://www.fieldlines.com/other/diamag1.html
http://www.matchrockets.com/ether/newmaglev.html
http://www.physics.ucla.edu/marty/diamag/
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- From: Primeau121
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