Magnet Myths and Misconceptions

[tinman]

A normal reed switch is not biased, it is just like a bit of iron: Its contacts are attracted by either pole of a magnet. In the central portion of your test, the reed contacts are equally attracted to both poles of the magnet so they don't move. This does _not_ mean that there is no magnetic field present! Just that the forces of attraction in both directions are equal and balanced.

You can bias a reed switch to respond only to one pole of the magnet by adding a balancing magnet on the other side of the switch, to cancel the force of attraction to one pole and reinforce the attraction to the other pole. Again, you are not cancelling the _fields_, just the experienced forces from the fields.

If I suspend a weight by a rope, have I cancelled the field of gravity on the weight? Of course not, I have just balanced its force downward by another force upward.

As you can see in my pic above,even when the reed switch is closer to one pole than the other,it will still remain open. I have mapped a long PM with the reed switch,and guess what-->yes,the peanut shape is clearly drawn around the magnet.
A ballance would come only from the center point of the magnet,and it clearly dose not.

In regards to your statement ,Quote: If I suspend a weight by a rope, have I cancelled the field of gravity on the weight? Of course not, I have just balanced its force downward by another force upward.

And what would be the net result of two equal and opposite forces?, Thats right=0

Please run your hall sensor test as you think it should be done TK,and let us know how it go's.

Wonder if it turns out the same as the reed switch test,the inductor test,the ferrofluid test,and one more yet to come.

[Pirate88179]

You have me howling you miserable "Skin Flint"! I tip my cleaning maid at least that much. You sound like you eat from trash cans! If you spent a fraction of the time you waste filling this forum up with useless verbosity on a part time job you could probably afford to eat more then dog kibble.

This is a quote from K&J:

USPS First Class Mail is a flat rate of $5. So that's a whole total of under ten bucks you're squealing about like a stuck pig!

But wait.  Isn't TK a paid shill?  Therefore he must have thousands of dollars at his disposal right?

But, if he is not a paid shill...maybe $10 is a lot of money to him, as is a lot of money to me.  As he has said, IF he did invest this money....the results would be poo-pooed anyway.  Money is very tight for a lot of us here my friends.  I am sure he did a cost/benefit analysis on this and I agree with his conclusion.

Bill

[DreamThinkBuild]

Hi All,

I've been testing with my setup and this is the closest analogy I could find from the results I'm getting(from my setup a couple of pages back).

The measurement is relative to the device doing the measurement.

If the coil is parallel to the magnet it is equivalent to measuring across each battery or with the field.

If the coil is perpendicular to the magnet it is equivalent to measuring from ground or between the fields. This will also show the polarity flip from the top half(N) to bottom half(S).


Hi TinselKoala,

Answer to your questions

1) It should work the same, but to clear doubts it could be with both solid cylinder and disc magnets.

2) Hope so, isn't that what it is designed for?

3) Not sure on the sensor but can say yes from my coil tests.

4) This is where I'm visualizing more like a neutral plane where the two fields equalize.

5) This again from my own tests is yes.

6) There is a polarity flip in the middle when the measuring perpendicular to the field.

7) Yes to some error threshold, it may diverge some. There is never a perfect magnet.

I could be wrong but always open to learning.


Hi Tinman,

Thanks for the tests. Were the measurements perpendicular to the field? I think the more data we can get the better.

[MileHigh]

Tinman:

Look at the image for the magnetic field for a single loop of wire.

A coil is just a bunch of loops of wire in a row.  So what does the magnetic field look like?  It's just a bunch of magnetic fields from single loops of wire added together.  Just do the vector addition in your head, forget about all of the strategies for making physical measurements for a second.

This "figure-8" business is completely wrong.  Just work out what the magnetic field looks like in your head.

MileHigh

[tinman]

Hi Tinman,

Thanks for the tests. Were the measurements perpendicular to the field? I think the more data we can get the better.

Ah-bingo with the pic below.
The reed switch was held both parallel and virtical(right angles)to the dipole plane,and the results were the same.