Do Electromagnets have a Curie Point?
Answer:
If you heat up a metal coil will it lose its magnetic field ?
The straight answer to this is 'No'. The magnetic field is produced by the current in the coil, and if this remains constant then the field will be constant also. Of course heating the coil might raise its resistance, and this might cause the current to fall, but this has nothing to do with Curie point.
Curie point refers to the loss of long-range ordering in a ferromagnetic material at a certain temperature. So this effect can only occur in a ferromagnetic material such as iron. If the electromagnet has an iron core, it will have a Curie point, and its magnetic properties will change at this temperature. This will cause a reduction in the magnetic flux B (which depends on the permeability of the core) but not on the field H (which depends on the current in the coil).
I think no Curie point, because the magnetism is due to the current flowing into the coil and not due to the magnetic property of the metal. Curie point only applies to the magnetic property of the metals not the magnetism due to current flowing in the wire.
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