Magnet Myths and Misconceptions

[Newton II]

@milehigh,


I meant a charged isolated conductor only.  So, your answer is 'YES'.

'A moving, charged isolated conductor produces  magnetic field'

1) In any purely mechanical system, work is 'force X distance'.  So, energy, which is total capacity you have, to do   work (either in faster
    rate or slowly) is conserved and total input energy equals the total output energy.

2) So, when you move a charged conductor applying mechanical force, its input and output energy is conserved as or used up as purely
     mechanical energy.    Then from where the charged conductor gets energy to produce magnetic  field which represents electrical energy?

3) Does it mean that magnetic field is created out of nothing? (I mean without input energy?)   
   
4) Does it also mean that moving charged conductor digs out energy from the vaccuum to create magnetic field?

5) Why should a moving charge produce magnetic field at any cost?   Either moving under the influence of electric potential or under
     mechanical force?

6) Does it mean that a magnetic field is absolutely necessary for a moving charge?

7) Does it also  mean that nature prefers creation of magnetic field more than conservation of energy?

[TinselKoala]

Mostly it means that your assumptions are still screwed up.

There is only ONE field, the electromagnetic field. Which aspect of it you experience depends on relative motion. If you move along with a moving charge you cannot detect any magnetic field from it, only electric field. But if you are stationary and that same charge moves past you at the same velocity, you see a magnetic field around the path of motion.


Look,  no magnets and no perceptible magnetic field (except in the belt drive motor):
http://www.youtube.com/watch?v=cj5T0zRALKc

Yet the capacitor is charging up with the same kind of voltage that is produced by a generator using magnetic fields. There is only one kind of voltage, and that is charge pressure caused by increasing charge density... and since the electron, a point particle, is the carrier of the unit negative charge, the only way to increase charge density in conductors is to do work against all those little electric fields, forcing more electrons to occupy the same space.

[TinselKoala]

@MH: Where does the voltage in a battery come from? Yes, it comes from an excess of electrons at one terminal and a deficit of them at the other terminal, and this is produced by the action of the imposed electric field from an external voltage source, on ions during charging.

http://en.wikipedia.org/wiki/Battery_%28electricity%29

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

[Newton II]

Mostly it means that your assumptions are still screwed up.

Agreed.  I am tightly screwed to ground by a screw jack on my ass.  A charged conductor passes infront of me with terrific speed and I would see a magnetic field around it.  After moving through some distance the conductor stops due to some reason.  So, I will see an electric field around the conductor.

But when magnetic field becomes electric field, I would also see some energy  released by 'self induction' or mutual induction.  What happens to that energy?  Will it come to me and further tighten the screw jack on my ass?

If I am blind I would neither see a magnetic field nor electric field but would only feel screw jack getting tightened on my ass.

Input energy = 100% mechanical energy

Output energy = 100% mechanical energy  + Energy released by collapsing magnetic field (energy received from where?)

Look,  no magnets and no perceptible magnetic field (except in the belt drive motor):
http://www.youtube.com/watch?v=cj5T0zRALKc

Yet the capacitor is charging up with the same kind of voltage that is produced by a generator using magnetic fields. There is only one kind of voltage, and that is charge pressure caused by increasing charge density... and since the electron, a point particle, is the carrier of the unit negative charge, the only way to increase charge density in conductors is to do work against all those little electric fields, forcing more electrons to occupy the same space.

I agree with all that.   But as you can see my question is different.   It is about a moving charged conductor producing a magnetic field (even
if it is an illusion) and releasing energy when field collapses.  This energy comes from where?   We are not doing any work on charges because the charges are also moving with the conductor as its integral part.

[Magluvin]

off that topic, I had an idea to wind a copper wire around a plastic toroid, 4in dia, 1/2in thick, 1/2in deep.  1 layer. Then make a rotor with all magnets N pointing out. just used 2 mags in the test.  It was a slap together thing, a bit off balance in every way, but just tried.  When I applied current to the coil, sometimes the rotor turned CW, sometimes CCW.  The idea was to have the mags close to the inside part of the coil and have the N poles of the mags ride the field spin around those inner windings.  As in a DC motor without pole switching. I chose to use a non magnetic core so as not to have it absorb the field away from the mags.  But a core may help, havnt gotten there yet. Busy with life. Try to get to some experiments here n there. Just throwing it out there.


Mags

Had an idea to build this a 'lil bit' differently.  Will draw it up later in 3D to show what im thinking before I build it.

Mags