DC through a magnetic field

[JohnRoberts]

Originally Posted by Arthurelletson

Ok this may should like a stupid question but I will ask it anyway as it has been bugging me.

There are no stupid questions. but I've heard clearer questions.

I know that if you run a voltage through a magnetic field the wire will jump,

Do you mean if you run a current through a wire coil? In a magnetic field?

but what will happen if it is fixed in place, say wound round a magnet and fastened in place.

Do you mean running a current through a coil in a magnetic field that is fixed?

Will this create a resistance?

Thanks

No. It will not create a resistance. The current in a coil will create the same force wrt the magnetic field, free or fixed, but if fixed, the force just "tries" to move the coil.

JR

[Arthurelletson]

Originally Posted by JohnRoberts

Do you mean if you run a current through a wire coil? In a magnetic field?


JR

Apologies. Yes current.

But surely something must happen as the energy that was transferred into kinetic must go elsewhere, possibly heat? As in an electric motor burning out?

Sorry its not something I know much about.

[JohnRoberts]

The current flowing in the wire generates heat whether the coil moves or not.

JR

[BillTodd]

The wire will have resistance and inductance.

The resistance of the wire is related to the material, its temperature, length and cross sectional area.This will not change by wrapping around the magnet.

The wires inductance will vary with length and to the 'permeability' of the material it is near.

Wrapping the length of wire around a magnet (high permeability) will increase the wires inductance and the magnetic field from the magnet will bias the saturation point of the inductor in one direction.