# Magnetism Project --> Need Help Please

• posted

hey im a sophomore in high school and I need help with a project o affecting the strength of a magnetic field...... first of all m project is seeing how certain materials can affect the strength of magnetic field, created by a bar magnet and a neodymium magnet. Th field will be measured using a CBL extension sensor from a TI-83 Plu graphing calculator. the independent variable will be placed betwee the magnet and the sensor anywhere from 2-10 centimeters between eac (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 i obvious, my fear is that other metals fill not affect the strengt and I will receive a failing grade. I need to know what metals ma affect the magnetic field, or anything that will affect it, for tha matter. Other metals will have an effect, but they may not b available to me (or I may not know it)

If you haven't already observed so, I have little knowledge of magnetic field and what may affect it. Any knowledge or insight yo may possess that may be helpful would be greatly appreciated. Than you for your time

• posted

Two things you might consider MuMetal varying magnetic fields

You might be able to find a bit of MuMetal that you could purchase somewhere. And a bit of reading can tell you something about it.

Second, varying magnetic fields behave very differently from static unchanging magnetic fields.

Both those might give you material to explore.

I'd recommend doing some reading on the subject. Learning is part of the process. And demonstrating what you have learned will probably impress those who are going to be looking at your results.

• posted

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