Magnet Myths and Misconceptions

[MileHigh]

Synchro1, you are polluting what is supposed to be an educational thread with junk fantasy postings.

[vineet_kiran]

A permanent magnet creates magnetic field around it for infinite time without losing energy of its electrons. Does it mean that magnetic field is created out of nothing?  Does a moving electron dig out energy from vaccuum (ether) to create magnetic field around it?

Why should a moving electron produce magnetic field?

Have a look at this experiment.

http://www.overunity.com/11016/eliminate-lenzs-current/msg290688/#msg290688


When a non-insulated 'spring' carrying current is compressed, number of turns becomes one.  Hence one turn has to produce tremendous
current to conserve the flux.    But a very high current cannot be maintained at low voltage. So, it has to dig energy from vaccuum to conserve the flux!

In the above experiment if flux is conserved then energy is not conserved and if energy is conversed, then flux is not conserved!   Nature
prefers what?  Conservetion of flux or energy?


http://science.howstuffworks.com/e-bomb3.htm

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


In a EMP weapon a current carrying coil is melted by making an explosion which makes number of turns in the coil zero resulting in sudden collapse of magnetic field which in turn creates severe electromagnetic pulses in the atmosphere.

EMP weapon produces EM pulses in an uncontrolled and vigorous manner.   In the above experiment you can produce controlled EM pulses.

[sparks]

  A magnetic field that is changing will cause charged particles to change their position.  Charged particles that are changing their position will cause a changing magnetic field.  That is why motors that claim to run using permanent magnets are mythical.  Please note the words CHANGE versus PERMANENT.  To create a permanent magnet take a conductor and cool it down until there is no thermal energy left in it.   You have increased the order within the conductor.   As they do when they manufacture a permanent magnet.  Now move your cold wire near a source of heat.  As  the chaos increases in the cold wire the magnetic field changes.  If there is a nearby conductor a current will be induced in the conductor.  It is simply the transfer of order from body to body.

[TinselKoala]

http://www.youtube.com/watch?v=V-M07N4a6-Y

(Compare this demonstration to some of the "demonstrations" and "experiments" that have been presented concerning magnetic fields on another thread.)

[fritz]

Hi,

what a fruitful discussion.
We all got bluffed at a certain point from these iron filing experimenters kits.....
Another typical myth or misconception - is the idea that an iron core "concentrates" the magnetic field lines(!!) of a coil - and thus intensifies the magnetic flux.
The truth is that the field from the coil stays the same - and the resulting flux is a superposition of the magnetized (by induction)field of the core and the coil.
Even if its often not that transparent - the links to the electric domain persist. The embedded charge of a dielectrica gets its orientation by electric induction and the increased flux  is a superposition of the originating flux and the flux of the induced dielectrica.
Both dielectrica and permeabilita are non-homogenous.... which explains why a cap is never empty..... and a coil needs few current to be neutral....

rgds.