The message
from Martin Brown contains these words:

The best neodymium rare earth alloy magnets these days are of order 1T.
I doubt very much if the scam artists are selling are selling anything
like top grade ones. Copper magnetic jewellry works by a powerful
placebo effect - the more you have paid for it the more effective you
will find it to be. The following is a reasonably fun toy science magnet
site.


For an even stronger effect, take several miles of niobium wire and wind
on a hollow core so as to produce an axial field.

Seal windings in a case, and introduce liquid nitrogen.

When the temperature of the windings has equalised with the liquid
nitrogen, their electrical resistance disappears, and a current can be
maintained by only overcoming the back-e.m.f. of the system.

You can then shoot electrons (or protons) at very high velocities,

(I used to work in a shop where we made niobium and tantalum.)

--
Rusty
Direct reply to: horrid dot squeak snailything zetnet point co period uk
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