Magnet Myths and Misconceptions

[sparks]

https://www.youtube.com/watch?v=QGytW_C6hR8&list=PL626A2BF1D244B8F6&index=2


  These are electromagnets I would assume.  So they would take stuff and magnetize it when they are on and when they are shut off the field collapsing would generate voltage.  The stuff that gets magnetized permanently would not however add to the voltage produced by the collapsing magnetic field of the electromagnet because well it's field is not collapsing.   The permanent magnet  now has the potential to demagnetize at another location.   Unfortunately it will take input of energy to collapse the magnetic field at location b.   You could heat it above it's curie point using sunlight or waste heat or an impact.  My point is that the whole process of storing energy in a magnetic field is really inefficient.   A resonant electrical system uses this shuffling of energy back and forth between magnetic and electrical fields to accumulate power form a low power scource like radio waves or a small battery.  The powerful discharge of the accumulated energy in a brief interval appears majical.  There is however no majic.   I believe Moray was tuning in some high frequency and simply redshifting it to low frequency.  He was working with crystals which are able to respond to very small wavelength signals.  The energy of a wave increases with frequency at any given intensity.  Store it in a resonant electrical device and light up bulbs to awe the herd.

[poynt99]

AC,

Are you certain your sensor isn't just saturating and that's why there is no change?

[MileHigh]

to stop any confusion on what i did and what i used, here a repeat of that action on video:

https://www.youtube.com/watch?v=qm718ND5WDo&feature=youtu.be


Sorry for mixing up the north south of the magnets all the time, North is on the left,   south on the right


Regards itsu

Itsu:

If you watch your clip at the end, the dip when you are doing the low scan is not replicated when you do the high scan.  On the high scan the 'dip' now becomes the peak.  So you can say it's 'opposite.'

That all makes sense relative to the standard field pattern.  The dip at the bottom is due to the flux density decreasing at the half-way point.  When you do the high scan, the probe is "entering the bubble" and then "exiting the bubble" with respect to the magnetic field there.  So you get a peak at the center of the bubble because at that height above the magnet you are in the densest flux stream in the middle.

Big Ben is still chiming!

MileHigh

[allcanadian]

@Itsu

to stop any confusion on what i did and what i used, here a repeat of that action on video:https://www.youtube.com/watch?v=qm718ND5WDo&feature=youtu.beSorry for mixing up the north south of the magnets all the time, North is on the left,   south on the right

I was using the same techniques taking a measure along the magnet side getting the same results. As well when rotating the probe on each end or pole I produced the same results as you have.


Now if you reduce the number of magnets so the width is near the same as the height then always point the same sensor face at the center of the stack you will see the field resembles two half spheres of opposite polarity. A cylinder magnet of equal diameter/height will produce better results.


This would seem to contradict the looped flux lines model in my opinion and there is a point above and below the magnet center where the sensor can be rotated 90 degrees with no change in magnitude nor polarity which raises many questions.


AC

[TinselKoala]

https://www.youtube.com/watch?v=QGytW_C6hR8&list=PL626A2BF1D244B8F6&index=2


  These are electromagnets I would assume.  So they would take stuff and magnetize it when they are on and when they are shut off the field collapsing would generate voltage.  The stuff that gets magnetized permanently would not however add to the voltage produced by the collapsing magnetic field of the electromagnet because well it's field is not collapsing.   The permanent magnet  now has the potential to demagnetize at another location.   Unfortunately it will take input of energy to collapse the magnetic field at location b.   You could heat it above it's curie point using sunlight or waste heat or an impact.  My point is that the whole process of storing energy in a magnetic field is really inefficient.   A resonant electrical system uses this shuffling of energy back and forth between magnetic and electrical fields to accumulate power form a low power scource like radio waves or a small battery.  The powerful discharge of the accumulated energy in a brief interval appears majical.  There is however no majic.   I believe Moray was tuning in some high frequency and simply redshifting it to low frequency.  He was working with crystals which are able to respond to very small wavelength signals.  The energy of a wave increases with frequency at any given intensity.  Store it in a resonant electrical device and light up bulbs to awe the herd.

I agree with you except for the part I've highlighted. Let's rephrase it so we can agree 100 percent: Storing energy by magnetizing  _permanent magnets_ and attempting to recover that stored energy is inefficient. On the other hand, storing and recovering _mechanical_ energy by using the attractive and repulsive forces associated with PMs, can be very efficient (I think most every pulse motor builder knows that the "cogging" of magnets/cores in relative motion is nearly energy-neutral, that is, an efficient storage and recovery of mechanical energy).

But we see very efficient storage and recovery of electrical energy from magnetic fields every day, all the time. Your computer would not operate, were it otherwise. Nor would radios or many other devices we use every day. Look at the definition of "Q"... the inefficiency comes from losses in a circuit's resistive elements and unintended radiation of power, not from storage and recovery in the magnetic field itself.