MadSci Network: Physics

Subject: Can a permanent magnet be made which mimics a current carrying conductor?

Date: Tue Oct 20 12:22:55 1998
Posted by Pius J. Zaleski
Grade level: undergrad
School: No school entered.
City: Orrville State/Province: OH
Country: USA
Area of science: Physics
ID: 908904175.Ph

I have seen the movement of a current carrying conductor in a 
magnetic field attributed to two different causes.

1) Interaction of the conductor's magnetic field with the magnetic 
field its in
2) Interaction of the conductor's moving charges with the magnetic 
field its in

My question is related to conducting an experiment to demonstrate 
whether 1 is the attributable cause by testing the hypothesis of 1.

I can envision building a permanent magnet mimicing a current 
carrying conductor by magnetizing long angular slices (i.e. angular 
sections of a long cylinder) of permanent magnet material by 
inserting them into a similarly shaped gap in the bend of a magnetic 
circuit which is as wide as the cylinder slices are long. These 
angular slices would then be combining to make a cylindrical 
permanent magnet with a circular magnetic field.  

However, I'm unsure whether the nature of the resulting manetic field 
would mimic that of a current carrying conductor which has been 
described in the literature as increasing linearly from zero at the 
conductor's center to a maximum at the conductor's surface and then 
decreasing inversely as the square of the distance from the 
conductor's surface in the space outside the conductor.

Your thoughts/suggestions are appreciated.

Re: Can a permanent magnet be made which mimics a current carrying conductor?

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