Alan Holmes wrote:

"Nick Maclaren" wrote in message
...

In article ,
Alan Holmes wrote:

I didn't know you could magnetise water!

You can magnetise pretty well anything at 10 tesla.

What is a tesla, does it hurt?

Only if you are wearing a mild steel belt buckle (or anything else
ferromagnetic). Really high power magnets are surrounded by warnings.

Telsa was a Russian guy heavily into arcs and sparks - and ultimately
responsible for the adoption of AC mains power distribution (Edison
wanted DC). He also gave his name to the SI unit of magnetic field strength.

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.

http://www.dansdata.com/magnets.htm

High end superconducting magnets used for NMR imaging are around 1-2T
and analysis now can be made up to 20T or so. They affect the spins of
atomic nuclei rather than the puny electrons responsible for chemistry.
The world record synthetic magnetic field is about one order of
magnitude higher still.

If unshielded they wipe bank cards in the blink of an eye.

Regards,
Martin Brown