Does a straight wire or Electron have a north and south magnetic pole?

[nemesiswes]

So does a wire actually have a magnetic north and south pole? I know a coil of wire will form one but a straight wire will only attract another wire if the other wire's current is going in the opposite direction and repel if in the same direction. I have looked for images and they always just show a magnetic field circling the wire with no apparent end like a bar magnet or coil of wire has.


2nd.
Does a electron in motion have a magnetic north or south?

 

[sophiecentaur]

You need to ask yourself what a magnetic pole is. What is it about a coil that produces 'poles'? You could even ask 'where' the actual pole of a coil of wire is. You have seen pictures of the field lines around various arrangements of wires and magnets.
Magnetic lines of flux are continuous and it's only in localised regions where they are closer together that we can identify a magnetic pole.
Straight wires and traveling electrons will generate a field but that field is symmetrical around the line of charge flow and are not 'scrunched up' anywhere.

 

[nemesiswes]

So then that is why it is said that magnetic fields don't end or start at anywhere? Electric charges have a start point and end point obviously but then a magnetic field doesn't actually have any start or end right?

 

[sophiecentaur]

Correct. The two fields are very different in that respect.

 

[sardar]

As a scientist, it is important to clarify that a straight wire does not have a magnetic north and south pole in the same sense as a bar magnet or a coil of wire. The magnetic field around a straight wire is created by the flow of current through the wire, and this field is circular and continuous around the wire. It does not have a distinct end or pole like a bar magnet does. The direction of the magnetic field is determined by the direction of the current flow in the wire, as you have mentioned with the attraction and repulsion of wires with opposite and same current directions.

In regards to electrons in motion, they do have a magnetic field associated with them due to their charge and motion. However, this field is much weaker than the magnetic field of a wire or a magnet. This is because the magnetic field of an electron is determined by its spin, which is a quantum property that is difficult to visualize or measure in everyday objects. So while an electron in motion does have a magnetic field, it is not the same as the magnetic field of a wire or a magnet.