On 01/12/2010 06:29 PM, Terry Blanton wrote: > On Tue, Jan 12, 2010 at 4:05 PM, Stephen A. Lawrence <[email protected]> wrote: > > >> [And by the way I'd still love to see a sketch of the field of the >> toroidal magnetic cores, if anyone happens to have a link to one (don't >> spend a lot of your time searching the Steorn site for a diagram, tho, >> please, just to save me the time to do that, wouldn't be fair).] > > This is from one of Fred Sparber's (GRHS) favorite sites (mine, too > since it's from Ga): > > http://hyperphysics.phy-astr.gsu.edu/Hbase/magnetic/toroid.html
Thanks, Terry... but unfortunately, that page is not what I'm looking
for. That's the field of the coil, and it's entirely contained within
the toroid.
I'm looking for a sketch of the field of the toroidal *core* when the
current is switched off. For the magnetism of the core to mean
anything, that field must not be entirely contained in the toroid, and
consequently must not be a purely circular field running parallel to the
torus ring.
The field of a permanent magnet must be either anchored in the magnet's
material, or knotted around part of the magnet, as in the attached
sketches. But those aren't the only possibilities for a toroidal
magnet, and I don't know what the fields of the Steorn toroidal magnets
look like.
("bad" in the image file names refers to the quality of the sketches,
which are, well, bad...)
<<attachment: bad-toroidal-field-2.jpg>>
<<attachment: bad-toroidal-mag-field-1.jpg>>
