magnetic field question?

Question

how do electrons moving through a wire create a magnetic field?

Answer 1

The magnetic field is actually a relativistic effect of the moving electric fields that result from the movement of charges. See the reference for a description. In a sense you could say there is no such thing as a magnetic field. Instead of considering the impact of a magnetic field, you could consider the impact of all of the changing electric fields. But the magnetic field is much easier to deal with.

Answer 2

In a bar magnet, there are electrons. Some of these electrons aren't paired, meaning they don't have another electron spinning in the opposite direction. As electrons spin or move down a wire they create magnetic fields. When another electron, in the same shell, spins in the opposite direction, it creates a magnetic field with it's field upside down in relation to the other electron, this cancels out the magnetic fields of both electrons. Some atoms have unpaired electrons, but Iron, nickel, colbolt, and magnesium have many. Only magnesium has enough to make the atom magnetic.
In magnesium, there are billions of magnetized atoms that have north and south poles. The atom's poles align, and make larger segments called domains. These domains are just a group of millions of magnetized atoms. These domains align, and make the whole piece of magnesium is now magnetic. When a piece of iron, nickel, or cobolt comes near the magnesium, the magnesium aligns the atoms of it, because the iron, nickel or cobolt have south and north poles. This attracts it, and it moves to the magnesium. The atoms in the iron, nickel or cobolt are aligned with the magnesium. When you put another piece of magnesium near the magnesium, it's domains are strong enough not to conform to the other's domains.
In a piece of wire, free, unpaired, electrons flow through the wire a certain direction, creating a magnetic field. When you coil the wire, the lines of force move through the coil. A selinoid has a magnet tip, depending on which way current is flowing, the selinoid is attracted or repelled. In a relay, there is a spring loaded switch next to a coil of wire. When you apply current to the coil, the switch closes.
Sorry this is so long, I like to diagnose electronics to the subatomic level.

Answer 3

some sturdy solutions the following between some obtuse or perhaps incorrect ones. certain to the precise wording of the question: the electric powered field is going out from the charge, and does no longer loop decrease back upon itself. even as the magnetic field itself is created via transferring electric powered charge (yet no longer the static electric powered field created via a table certain charge!), and continuously loops decrease back upon itself. This latter sources is represented as one in each of Maxwell's/Heavisides' Equations. The equation in question states that the divergence of a magnetic field is a similar as 0. This describes our modern recognize-how that the magnetic field or lines do no longer originate from a element charge, compared to an electric powered field. And that, back, the magnetic field itself has no line ends, because the lines (or field) continuously varieties a continuous loop decrease back upon itself.

Answer 4

Ah, mysteries of physics.

Your question is about many moving electrons.
The anser is: Because a electron creates a magnetic field.
So the real question is: Why does an electron do that?

And that's a mystery.
It does it, and magnetism is one of the core-forces of physics.

Answer 5

http://regentsprep.org/Regents/physics/phys03/cdeflecte/default.htm





http://www-spof.gsfc.nasa.gov/Education/wmfield.html



http://en.wikipedia.org/wiki/Magnetism