Thread: the cause of magnetism

What is the cause of magnetism?
If one takes two magnets and holds them to each other it will either repel or attract each other.
How come is this so?
Why does the magnet repel itself and seemingly push itself away from the other magnet. The magnetic field is known to me, it seems that we know allot about magnets, but whets really happening is unknown.

Pleas don’t explain what a magnetic fled or such is
if you don't know what magnetism is look at this:


wikipedia

thank you,

miomaz

Magnetism is actually a relativistic effect - it has to do with special relativity and the geometry that carries along into electrodynamics.

How deep an explanation are you after, as things get sticky very quickly here.

how come does the magnet act if it would collide with some substance while the 2 magnetic fields collide?

electric field is produced by any charge. magnetic field can only be produced by moving charges (like in a current for example)

look up the biot-savart law to find out exactly how much magnetic field is generated by a moving charge

magnets apply a force which can be felt at a distance. this concept can be explained only with the help of vectoe magnetic fields. as in the case of gravity.

Nice but... you haven't answered the question.
You have explained how they are made and how they are explained, but what repells? It seems to me that magnets have its own little space dimansion which is ofcourse impossible.

In 1819 Hans Christian Oersted observed that a wire carrying a current could deflect a compass needle, this implied that a current in a wire produces a magnetic field. It was later realized that the magnetism in a material could be explained by considering moving electrical charges on an atomic level. Due to its orbit and spin, an electron can be treated as a current, producing a magnetic moment; the nucleus also has a magnetic moment associated with the spin of its protons, but it is only about 1/2000 of the magnetic electron spin moment. When atoms condense to form a crystal, the orbits are largely fixed to the atomic bonds; the resulting spin moments - partially diminished by next-neighbour interactions - can then be rotated by an applied field, this mechanism is principally responsible for a material’s magnetization.

Originally Posted by miomaz

What is the cause of magnetism?
If one takes two magnets and holds them to each other it will either repel or attract each other.
How come is this so?
Why does the magnet repel itself and seemingly push itself away from the other magnet. The magnetic field is known to me, it seems that we know allot about magnets, but whets really happening is unknown.

Pleas don’t explain what a magnetic fled or such is
if you don't know what magnetism is look at this:

thank you,

miomaz

Magnetism is caused by electrical currents and only electrical currents.

checkout: h t t p://farside.ph.utexas.edu/teaching/302l/lectures/node77.html

The electrons in the material align, the inner ones canceling out and the current flows along the outside of the material. Contrary to popular belief it has nothing to do with Special relativity or general relativity, but Maxwell's equations and electrodynamics. It is a basic understanding in electrical engineering, which it seems a lot more people need to study up on.

Originally Posted by sjw40364

Originally Posted by miomaz

What is the cause of magnetism?
If one takes two magnets and holds them to each other it will either repel or attract each other.
How come is this so?
Why does the magnet repel itself and seemingly push itself away from the other magnet. The magnetic field is known to me, it seems that we know allot about magnets, but whets really happening is unknown.

Pleas don’t explain what a magnetic fled or such is
if you don't know what magnetism is look at this:

thank you,

miomaz

Magnetism is caused by electrical currents and only electrical currents.

checkout: h t t p://farside.ph.utexas.edu/teaching/302l/lectures/node77.html

The electrons in the material align, the inner ones canceling out and the current flows along the outside of the material. Contrary to popular belief it has nothing to do with Special relativity or general relativity, but Maxwell's equations and electrodynamics. It is a basic understanding in electrical engineering, which it seems a lot more people need to study up on.

The OP presumably has by now gotten the answer he/she wanted 7 years ago.

As for the "only electrical currents" part of your answer, that declaration could be misconstrued to exclude spin. That would be unfortunate, for spin actually dominates ferromagnetism, for example.

Originally Posted by tk421

Originally Posted by sjw40364

Originally Posted by miomaz

What is the cause of magnetism?
If one takes two magnets and holds them to each other it will either repel or attract each other.
How come is this so?
Why does the magnet repel itself and seemingly push itself away from the other magnet. The magnetic field is known to me, it seems that we know allot about magnets, but whets really happening is unknown.

Pleas don’t explain what a magnetic fled or such is
if you don't know what magnetism is look at this:

thank you,

miomaz

Magnetism is caused by electrical currents and only electrical currents.

checkout: h t t p://farside.ph.utexas.edu/teaching/302l/lectures/node77.html

The electrons in the material align, the inner ones canceling out and the current flows along the outside of the material. Contrary to popular belief it has nothing to do with Special relativity or general relativity, but Maxwell's equations and electrodynamics. It is a basic understanding in electrical engineering, which it seems a lot more people need to study up on.

The OP presumably has by now gotten the answer he/she wanted 7 years ago.

As for the "only electrical currents" part of your answer, that declaration could be misconstrued to exclude spin. That would be unfortunate, for spin actually dominates ferromagnetism, for example.

And what is spin? The movement of electric charge, which is electric current. You can disguise those charged quarks as blue, red and green if you want, but they are charged particles. And since there is no gravitational model of the atom, i hope you wont mind if I ignore GR in any explanation.

Originally Posted by sjw40364

And what is spin? The movement of electric charge, which is electric current. You can disguise those charged quarks as blue, red and green if you want, but they are charged particles. And since there is no gravitational model of the atom, i hope you wont mind if I ignore GR in any explanation.

As I said, your answer could be misconstrued; I didn't say that it was wrong. But that doesn't mean that the explanation couldn't be improved. A reader at the level of the OP would likely not consider spin to be a source of electric current. It certainly isn't what is accommodated in things like Ohm's law, for example. Spin is an unfamiliar beast to many, but it is central to the OP's question.

Magnetism is caused by the speed-of-light delay in the action of the electric force.

Originally Posted by Schneibster

Magnetism is caused by the speed-of-light delay in the action of the electric force.

I think that's glib to the point of being wrong. An isolated electron exhibits a nonzero magnetic moment, due to spin. Speed of light delay does not appear in any derivation with which I am familiar. If you have a reference for your statement, I would be most interested in it.

Originally Posted by tk421

Originally Posted by Schneibster

Magnetism is caused by the speed-of-light delay in the action of the electric force.

I think that's glib to the point of being wrong. An isolated electron exhibits a nonzero magnetic moment, due to spin. Speed of light delay does not appear in any derivation with which I am familiar. If you have a reference for your statement, I would be most interested in it.

Schneib is just trolling.

Originally Posted by xyzt

Schneib is just trolling.

Most unfortunate if true.