What exactly does the pull force of a magnet mean?
Posted 4 May 2009 - 08:04 AM
My question is about magnets. I am looking at a few, pull force is about 40 lbs. What does this mean, and how does that relate to the repulsive force?
Is there and equation to find out how much two magnets (40 lb pull force) will repel at different distances?
Posted 4 May 2009 - 04:10 PM
According to http://www.kjmagneti...om/glossary.asp
(They go on to provide a table of pull forces for magnets they sell.)
Pull Force - The force required to pull a magnet free from a flat steel plate using force perpendicular to the surface. The limit of the holding power of a magnet. The pull force listed is actual data acquired by testing using our state-of-the-art force test stand.
Magnets are dipoles and their field drops off as 1/r^3 The torque you get from two dipoles is given here
You should be able to discern the force if you know the geometry of the magnet since T = r X F
Magnetic calculator based on material and size
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Posted 9 April 2010 - 08:46 AM
what is the farthest distance of a magnet (that has a pull force of 193.04lbs.) attracts a 10 gram metal coin?
Posted 9 April 2010 - 09:32 AM
So, equate the force of the magnet to the weight of the coin and find "d".
Posted 10 April 2010 - 04:26 PM
Posted 10 April 2010 - 07:12 PM
There are other issues too.
The question is not well enough defined to answer it.
Posted 11 April 2010 - 02:53 PM
Edited by Amr Morsi, 11 April 2010 - 06:07 PM.
Posted 19 August 2011 - 04:33 PM
Where HPF is the Head Pull Force
and Pole is peculiar to each substance (magnet or magnetic) and depends upon magnetization and permeability volume, density and shape.
This is on the axis of the magnet, and deviates much more away from the axis.
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