sci.physics.electromag

On Feb 28, 6:13 pm, Mike D wrote:

> The quickest way to get an answer to 1 is to use one of the online
> calculators. For example:http://www.dextermag.com/CalculationList.aspx
> Neo45 will have a Br of approximately 1.37 Tesla (13,700 Gauss)
>
> For 2: The field generally drops as a function of the square of the
> distance
>
> For 3: The same webpage above will give you a reasonable approximation
> of the field between two magnets (although admittedly on a steel
> yoke).

Hey, Thanks! That online calculator sure is nifty! In playing with it
I see that the main parameter is the Residual B of the magnetic
material itself. Like I suspected since the lifting force depends on
area it sort of cancels out. Also in trying different size magnets I
found that the field is always the same at the center of the surface
for all magnets of proportional shape! Like say 1 x1, .5 x .5 and .25
x 25 etc. in cylinders. This is exactly what I was looking for!

Now I'm wondering what the calculation is they are doing? That the
trouble with online calculators, you sometimes have trouble figuring
out is being calculated. Wonder if the source in the html...?

great site! Thanks.

...And now to build that perpetual motion free energy machine! (just
kidding!)