Re: Does a magnet grow less magnetic over time?
- From: "Szczepan Białek" <sz.bialek@xxxxx>
- Date: Mon, 3 Nov 2008 10:15:34 +0100
"P." <dit3_werkt_ook_niet@xxxxxxxxxxx> wrote
news:356rg45807vf5u9fe2dju8i6h6e9oq2qji@xxxxxxxxxx
On Thu, 30 Oct 2008 08:23:17 -0700 (PDT), Tue Sørensen
<sorensonian@xxxxxxxxx> wrote:
Hence, it seems to me that the
magnetism must somehow degrade over time...
Thanks for any reply.
- Tue Sorensen
How well a magnet keeps its magnetism depends on the materials.
Ferrite and modern ones stay good a long time. Alnico degrade in some
years (5 to 30) to lower level of magnetism.
To make magnets we must "pump" an energy in the materials.
A magnetic field is not "consumed" when producing energy in for
example a generator. It is used to place a force on electrons so they
will give a pressure and flow in copper wires (the pressure is the
voltage, the flow the current). And that can be used to convert
mechanical energy (rotation of axis) into electrical energy. It is
just a .
Yes. But in magnet motors (toys) is "consumed". We can arrange the "magnetic
gearbox" or source of energy.
S*
P.
.
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