Magnet Myths and Misconceptions

[Newton II]

but you can be assured that every field line emitted by the thing is in fact a closed loop that has no terminations. DivB=0.

Somewhere I had read that  magnetic field or field lines around a magnet extends upto infinity  but  you will feel  magnetic force only upto some distance from poles because field lines will be concentrated near the poles and will diverge out at farther distances.

So,  if you keep some sort of magnetic field or field line 'sucker'  inside the magnet and go on sucking field lines towards magnet,  will the strength of field near the poles become infinity?  Because field lines come closer and closer rising the density of flux near the poles?

Situation is somewhat like a star go on sucking its mass towards centre and gets converted into a black hole with terrific Gravitational field strength around it.

Just a crazy question.    Please don't take it seriousley.

[bboj]

@TKI started using electron flow notation exclusively about 15 years ago when my primary area of research was electrostatics, personally I find it easier.
A simple analogy may be to see conductors as a basket of apples and oranges, if there an equal number of apples and oranges the charge is neutral. If there are more apples then the basket has an apple charge and if the there are less apples then there must be more oranges and the basket has an orange charge. When we move the apples to and from the basket then this motion of the apples is called an electric current.
Apples are electrons oranges protons.
We could also say if the apples are moving it is an electric current of apples and if the oranges are moving so must the basket or conductor of apples.
We say this because the protons are bound to electrons in the material of the conductor and must move with it. On the other hand the free electrons may move within the material producing a charge separation in objects or produce a net charge if an alternative path is present and this motion is called an electric current.
It is funny that something so simple could cause so much confusion which is why I believe the basics are so important. I think understanding the basics may lead to more questions and these questions answers.
As such we could say most of our technology is nothing more than a basket of fruit, apples and oranges, we pump out apples into a loop or circuit only to have the same apples return to the same basket. Apples and oranges are not Energy, the pumping action which caused the apples to move is work and the motion of the apples Energy. Now if we could just find some apples which refused to stop moving our troubles would be over, lol.
I think it's kind of neat how a small change in context can produce a large change in our perception of things and how they work.

AC

This is all clear to me. But the question at the beggining of the thread was if  move apples int the conductor how come that the resulting magnetic field around this same conductor is static?

[Magluvin]

Hey Mags
Was it direct current or were you pulsing the coil.

Iv been thinking about the way a motor works
A current carrying wire is pushed out of the magnetic field, if the current runs one way its expelled in one direction, change direction of the current and the wire is expelled in the other direction.

I wonder if a pancake coil is sandwiched between two toroid speaker magnets and a current is pulsed into the center of the coil will the magnet add energy to the electrons as they are pushed out, and will there be any bemf.

Instead of trying to collect more electrons from the ambient can we add energy to the electrons we already have.
Its just something Iv been wanting to try.

electron acceleration?
So many idea's so little time.
I know what you mean by work and family, I need to spend more time on both.

dave

Hey Dave

Ever seen these mono polar motors with the disk mag magnetized to the AA battery and the wire loop that spins around it?  Well this should be similar except im not using 1 wire as they are, but have a rotor with the say N poles of multiple mags very close to the inside windings of a toroid coil. Like Faraday, with current flowing in all the wires the same direction, the rotor should spin with DC applied to the coil.

The other way of doing it would be to have say 2 copper rings, a top and bottom with many thin wires attached from the bottom ring to the top ring, probably as many as possible so there is no spacing between thin wires, then apply dc or pulsing to the top and bottom rings so all the thin wires conduct current in the same direction. This should make the rotor move, all mags with same pole outward.  The first one like I said was simple rough slap together, nowhere near perfect. But the rotor would pop into acceleration just tapping the coil ends with voltage.  I dont know why it would go in either direction at times. could have been spacing of the toroid windings. Inside the say air core toroid, when dc current is applied, the field is oriented in one direction internally, and on the outside of the windings the field is oriented in the opposite direction. So using the toroid model may pose issues as to how it affects the facing field of the magnets once current is applied, due to the field of the mag is inside an outside of the toroid winding before current is applied. But my 2 rings with thin wires vertical from the bottom and top ring eliminates some of the toroidal core area concentration. 

Im planning the build at my shop as we speak. Going with the top and bottom ring with thin wires. Thought of just a short copper tube, 2in is what I have, but I believe there would be too much eddy currents vs thin vertical wires in parallel.      Plus, in the tube,  if we attach input wires to the top and bottom of the copper tube, would currents be equal and in the same straight up or down direction in all portions of the tube. 

hope to complete today.

Mags

[tinman]

Thanks, I am especially proud of this unit. Unfortunately it is in limbo, in storage in Canada along with a bunch of other really neat stuff that I'll probably never see again.

This is not good TK-can you not get it all shiped down to you?. Would be awsome to see all your old gear up and running again.

[TinselKoala]

This is all clear to me. But the question at the beggining of the thread was if  move apples int the conductor how come that the resulting magnetic field around this same conductor is static?

This has been answered several times. Is there some problem with your understanding of the answer you have already been given?