Electromagnet and a current carrying wire

[Hami Hashmi]

Hi,
My understanding of an electromagnet is that it is a material with low susceptibility and high permeability, i.e. the magnetic field is not permanent but in the application of a current then the material gets a large magnetic field. In the application of a current the spins of the electrons in the material align in the same direction so the material gets a net "magnetic moment" or magnetic field. I have read on Wikipedia that the magnetic core "focuses" the field caused by the current so the field strength increases by thousands of times. I also know that the current is caused by an electric field drawing the loose valance electrons forward to make a flow of electricity. So my question is this: if you had a hypothetical wire that had in its interior a vacuum, and a shell that no electrons could escape from, could this wire, if wrapped around a material with
high permeability, generate a magnetic field? I am not sure if the electrons have to escape the wire and go into the magnetic core for the material to get a magnetic field.

 

[davenn]

So my question is this: if you had a hypothetical wire that had in its interior a vacuum, and a shell that no electrons could escape from, could this wire,

What do you mean by this ??

I am not sure if the electrons have to escape the wire and go into the magnetic core for the material to get a magnetic field.

of course not ... that doesn't happen in a normal electro-magnet
Also the wire of the coil is insulated otherwise the turns of the coil would short circuit

 

[anorlunda]

if you had a hypothetical wire that had in its interior a vacuum, and a shell that no electrons could escape from, could this wire, if wrapped around a material with
high permeability, generate a magnetic field?

Do you mean a wire with a vacuum-filled hollow core, like a hollow cylinder? There is essentially no difference between that and a regular wire.

 

[Hami Hashmi]

Yea that's what I mean.

 

[anorlunda]

Thanks that was the answer i was looking for speaking of my education level I have not studied maxwell's equations yet but I put it as intermediate because i thought that someone with that education level could answer my question.

No, it refers to the type of answer you get. An I answer is likely mathematical. A B answer is mostly in words. I'm going to change this thread to B for you and I cleaned up the posts. Hopefully that might get some good answers for you.