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Why do magnetic business cards not act like N&S pole magnets ?
self | February 11, 2013 | knarf

Posted on 02/11/2013 8:21:41 AM PST by knarf

Playin' around with a couple of 'em and they don't do a "repel" thing


TOPICS: Chit/Chat; Education; Science
KEYWORDS: magneticcards; magnetism
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wonderin'
1 posted on 02/11/2013 8:21:46 AM PST by knarf
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To: knarf

It could be that they are magnetized too weakly to really do anything.


2 posted on 02/11/2013 8:25:20 AM PST by Jonty30 (What Islam and secularism have in common is that they are both death cults.)
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To: knarf

The card’s magnetized portion has many small N/S orientations...arranged in a specific manner so as to 1) generate a “clock” signal when the card is swiped - so as to allow the reader to correctly detect and decode the 2) actual binary data contained on the strip.

These individual portions of N/S orientation appear almost random from any distance greater than a mm or so, and therefore cancel out.


3 posted on 02/11/2013 8:25:29 AM PST by Da Coyote
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To: knarf

I think I looked that up one time years ago after noticing he same thing. IIRC, the magnetic material is contiguous, but I believe stripes are magnetized in aleternating N/S strips. IOW not one big magnet but striped magnet strips that alternate and separated just enough......hope this is right and helps.


4 posted on 02/11/2013 8:25:34 AM PST by Gaffer
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To: knarf
The big black rubber backing is magnetized with strips going N-S, S-N, N-S, S-N, etc.


5 posted on 02/11/2013 8:25:52 AM PST by Yo-Yo
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To: knarf

Short answer? Because Sandy Hook.


6 posted on 02/11/2013 8:26:08 AM PST by 1rudeboy
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To: knarf
There are hundreds of tiny, weak ones in the strip, oriented this way or that to form a binary code.
Too weak to pick anything up. Strong enough to be detected by a reader.

7 posted on 02/11/2013 8:26:24 AM PST by BitWielder1 (Corporate Profits are better than Government Waste)
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To: knarf

‘Cuz the poles go in and out of the card rather than parallel to the card? It does kinda work if you flip the cards end to end. Then, what do I know .... LOL


8 posted on 02/11/2013 8:27:04 AM PST by SkyDancer (Live your life in such a way that the Westboro church will want to picket your funeral.)
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To: Da Coyote

I think knarf is talking about essential refrigerator type magnet business cards, not data-swipe cards.


9 posted on 02/11/2013 8:27:25 AM PST by Gaffer
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To: knarf

 

 

 

 

 

 

 

(Too much time on your hands)

10 posted on 02/11/2013 8:34:56 AM PST by Responsibility2nd (NO LIBS. This Means Liberals and (L)libertarians! Same Thing. NO LIBS!!)
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To: Gaffer
Yep .. refrigerator magnets .. and .. after posting, I discovered if I put two cards togther magnet to magnet, and slide them, there is a definite 'washboard' effect which aligns with (pun intended) the NS/SN/NS/SN etc. explanation.

Interesting

If we think hard enough about this, maybe we can develope a perpetual motion mation.

(I AM kidding ... but it IS interesting)

11 posted on 02/11/2013 8:35:42 AM PST by knarf (I say things that are true ... I have no proof ... but they're true)
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To: Gaffer
I've been looking and looking for the magnetic monopole I lost years ago.

Thanks for finding it.

12 posted on 02/11/2013 8:36:25 AM PST by Paladin2
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To: knarf

I pulled two off my tool chest, to experiment.

Mine stick together, then when moved slightly, they repel, and seek to move back or forward to the next ‘sticky’ position.

So the attract-repel feature is still there, but the cards are not magnitized as a single magnet with a N-S at each end.

The N-S must be in a pattern (such as stripes) on the card. The card is a bunch of iron particles embedded in a non-magnetic plastic-like material.

Next step would be to seek info from the Google info god, but I’ll leave that for the next Nobel Peace Prize seeker.


13 posted on 02/11/2013 8:36:42 AM PST by Scrambler Bob ( Concerning bo -- that refers to the president. If I capitalize it, I mean the dog.)
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To: Responsibility2nd
There ARE advantages to .. I don't HAVE to go to work.

Puttin' some else's kids through college never appealed to me.

14 posted on 02/11/2013 8:37:47 AM PST by knarf (I say things that are true ... I have no proof ... but they're true)
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To: Paladin2

BS


15 posted on 02/11/2013 8:37:47 AM PST by Gaffer
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To: Gaffer
That is what I thought too.

So I am looking at a couple and offer three observations:

1. They do stick together.

2. You can slide one across the other smoothly in the horizontal direction.

3. You cannot slide one across the other smoothly in the vertical direction. There is a "jump" from one position to another at about 1/8 inch increments. In-between those positions, the cards are repelling one another.

So I must conclude that the surface is magnetized like this:

++++++++++++
------------
++++++++++++
------------
++++++++++++
------------
++++++++++++
------------

16 posted on 02/11/2013 8:37:55 AM PST by The Free Engineer
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To: knarf
Well grasshopper, the wisdom you seek can only be found upon a barstool.

Image Hosted by ImageShack.us

Now I'm off to discover why the microwave tray turns one way till I turn the oven off and on again when the tray turns the other way.
17 posted on 02/11/2013 8:38:01 AM PST by cripplecreek (REMEMBER THE RIVER RAISIN!)
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To: The Free Engineer; Paladin2

Just like I said.


18 posted on 02/11/2013 8:39:22 AM PST by Gaffer
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To: knarf

Did you try floating them in a bowl of water and see if it points north?


19 posted on 02/11/2013 8:40:12 AM PST by Olog-hai
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To: knarf

If we could only get congress to put this much effort into the debt, we might just get somewhere... :)


20 posted on 02/11/2013 8:40:36 AM PST by vet7279 (Those of you who think you know it all are very annoying to those of us who do!)
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To: knarf
Sometimes size matters..........

Imagine if all those coded items you buy were strong enough to act as a magnet. At Christmas, my daughters steering wheel would be in the bag of her van.

21 posted on 02/11/2013 8:41:22 AM PST by Sacajaweau
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To: knarf

Slow day at work?


22 posted on 02/11/2013 8:42:03 AM PST by envisio (Its on like Donkey Kong!!)
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To: cripplecreek

DAMN!, I love freepin’ wit’ Freepers !!!


23 posted on 02/11/2013 8:42:13 AM PST by knarf (I say things that are true ... I have no proof ... but they're true)
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To: knarf

It’s called a Halbach array.

Good article on it here.
http://www.kjmagnetics.com/blog.asp?p=halbach-arrays


24 posted on 02/11/2013 8:43:43 AM PST by wsack
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To: knarf

http://www.ehow.com/info_8561061_ways-magnetic-strips-atm-cards.html


25 posted on 02/11/2013 8:43:43 AM PST by Sacajaweau
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To: knarf

We did that as kids...We learned to magnetize items by changing the alignment of the poles using another magnet.


26 posted on 02/11/2013 8:45:33 AM PST by Sacajaweau
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To: knarf
"If we think hard enough about this, maybe we can develope a perpetual motion machine"

Don't say that too loudly. A Chicago business may use the idea to get a $1B DOE grant.

27 posted on 02/11/2013 8:46:28 AM PST by Pecos (If more sane people carried guns, fewer crazies would get off a second shot.)
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To: cripplecreek

Oh my God....That’s so funny....


28 posted on 02/11/2013 8:47:10 AM PST by Sacajaweau
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To: Scrambler Bob

Years ago...I had a very large, strong ship magnet....and it demagnetized my card.


29 posted on 02/11/2013 8:49:25 AM PST by Sacajaweau
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To: Olog-hai

That’s an old surveyors trick. There was a story attached to it but it’s been years....maybe occurred in the 1790’s when they were generally doing magnetic surveys.


30 posted on 02/11/2013 8:53:01 AM PST by Sacajaweau
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To: SkyDancer
Cuz the poles go in and out

Are you making a Polish joke? That's racist ! /s

31 posted on 02/11/2013 8:55:31 AM PST by llevrok (Unlike Obama, at least Nero could play a fiddle.)
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To: knarf
I've seen a "reader" for those magnetic strips in science catalogs. It has a magnifying lens at one end of a clear plastic tube with a sealed chamber at the other end filled with a very fine iron powder. It clearly shows the magnetic stripes in the strip of material. It works on audio and video tapes as well and I think it was created for technicians to check head alignment on tape recorders.

Regards,
GtG

32 posted on 02/11/2013 8:57:34 AM PST by Gandalf_The_Gray (I live in my own little world, I like it 'cuz they know me here.)
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To: llevrok

And what with “in and out”, it may be homophobic too. /ß


33 posted on 02/11/2013 8:57:48 AM PST by Olog-hai
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To: cripplecreek

Well grasshopper, the wisdom you seek can only be found upon a barstool
= = = = = = = = = = = =
Excellent example.

“Al Bundy” also had a theory of “Old data is replaced with ‘new data’ when it comes to the brain”.

Kelly had won a spot on a quiz show and Bud and Al force fed Kelly facts, knowing the more put in the faster the old went out. Anyhow she got to the final round for ALL the prize (probably dinner for 6??) and the question was “Who was the GREAT HS running back that set all kinds of records HAD to get married and ended up as a miserable shoe salesman”?(close)
Well, Kelly had reached her ‘depth’ limit and while answering some real tough questions she couldn’t answer the one that she basically heard every day of her life.


34 posted on 02/11/2013 9:04:04 AM PST by xrmusn (6/98 "It is virtually impossible to clean the pond as long as the pigs are still crapping in it")
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To: 1rudeboy

Bush’s Fault


35 posted on 02/11/2013 9:04:30 AM PST by Organic Panic
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To: Sacajaweau

Speaking of credit cards —

The local Radio Shack had a magnet pad on their counter top to demagnetize the anti-theft devices imbedded in some products. It had a warning about don’t get credit cards too close.

But one day, I saw a customer hand his credit card to the clerk, and in that transaction, it passed near the pad.

Credit card did not work anymore. They both wondered what happened. I paid cash.


36 posted on 02/11/2013 9:12:15 AM PST by Scrambler Bob ( Concerning bo -- that refers to the president. If I capitalize it, I mean the dog.)
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To: Gandalf_The_Gray

“I’ve seen a “reader” for those magnetic strips”

In the computer department, Hans L. would open this small wooden case, and remove a circular item. It was about the size of 4, stacked 50-cent pieces. It was transparent, with a dark section in the middle. He would rub it (magic?) then move it over the beginning sections of 1/2-inch magnetic computer tape.

“Yep, this is a 9-track, and it is EBCDIC encoded”

And sure enough, with the right command the tape could be loaded and read!


37 posted on 02/11/2013 9:24:57 AM PST by Scrambler Bob ( Concerning bo -- that refers to the president. If I capitalize it, I mean the dog.)
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To: knarf

I’ve actually designed these type magnets.
The energy needed to make one big N and one big S on the other side it huge, but if you make smaller and smaller marnetic areas, it gets down to being easy and lends itself to mass production techniques.
How many poles per square inch is just a matter of the tooling. but it is far easier to just line things up in small series magnetic circuits that alternate across the piece of material.
The result is a magnetic sheet of iron oxide filled vinyl that can be used for refrigerator agnets or other items and is easy to fabricate in large quantities.


38 posted on 02/11/2013 9:27:58 AM PST by BuffaloJack (Children, pets, and slaves get taken care of. Free Men take care of themselves.)
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To: knarf

I’ve actually designed these type magnets.
The energy needed to make one big N and one big S on the other side it huge, but if you make smaller and smaller marnetic areas, it gets down to being easy and lends itself to mass production techniques.
How many poles per square inch is just a matter of the tooling. but it is far easier to just line things up in small series magnetic circuits that alternate across the piece of material.
The result is a magnetic sheet of iron oxide filled vinyl that can be used for refrigerator agnets or other items and is easy to fabricate in large quantities.


39 posted on 02/11/2013 9:27:58 AM PST by BuffaloJack (Children, pets, and slaves get taken care of. Free Men take care of themselves.)
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To: knarf

Magnetized too weakly PLUS the strip has an alternating pattern of North and South to it.
So teh strip would look like !i!ii!i!!i!!!i!i!iii if “!” represented north and “i” represented south.
The magnetic fields would have to be aligned the same way AND of a high enough strength.


40 posted on 02/11/2013 9:34:34 AM PST by Darksheare (Try my coffee, first one's free.....)
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To: llevrok

Good ‘un - what I was trying to say was instead of the pole laying down or put down on a sheet N/S the were laid down vertical. OTOH Polish is not a race. LOL


41 posted on 02/11/2013 9:41:50 AM PST by SkyDancer (Live your life in such a way that the Westboro church will want to picket your funeral.)
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To: knarf

It’s also binary data.
North being 1 or “on” and South being 0 or “Off” or vice versa.


42 posted on 02/11/2013 9:42:48 AM PST by Darksheare (Try my coffee, first one's free.....)
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To: SkyDancer
Kelly Bundy
43 posted on 02/11/2013 9:55:59 AM PST by bicyclerepair (Zombies Eat Brains. Half of FL is safe.)
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To: Scrambler Bob
“Yep, this is a 9-track, and it is EBCDIC encoded” And sure enough, with the right command the tape could be loaded and read!

Back in the day, computer terminals were Kleinschmidt teletype ASR 33s with a built in reader/punch for seven level paper tape. I got pretty good at reading the hole patterns. We even had a short program that would punch a leader where the holes made block letters so you could name and date your tapes with human readable text.

Regards,
GtG

44 posted on 02/11/2013 10:11:26 AM PST by Gandalf_The_Gray (I live in my own little world, I like it 'cuz they know me here.)
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To: SkyDancer
OTOH Polish is not a race

That's not what my Dad used to say!!!

45 posted on 02/11/2013 10:13:08 AM PST by llevrok (Unlike Obama, at least Nero could play a fiddle.)
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To: llevrok

What? Yer dad was a Lithuanian or Latvian??? LOL


46 posted on 02/11/2013 10:18:44 AM PST by SkyDancer (Live your life in such a way that the Westboro church will want to picket your funeral.)
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To: xrmusn
Sounds similar to the episode of the Honeymooners where Ralph was chosen to appear on Name That Tune.

I'm guessing our two examples say something about our relative ages.

47 posted on 02/11/2013 11:04:08 AM PST by rmh47 (Go Kats! - Got eight? NRA Life Member])
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To: envisio

“Slow day at work?”

Maybe, more likely cut class the day magnetism was covered in 8th grade science.

(your punishment will...to (k)narfle the garthok!)


48 posted on 02/11/2013 11:15:56 AM PST by RJS1950 (The democrats are the "enemies foreign and domestic" cited in the federal oath)
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To: rmh47

I’m guessing our two examples say something about our relative ages
= = = = = = = = = = = = = =
AH, but I do remember Ralph, Alice, Ed, Trixie, also Arch, Edith, Meathead, Gloria, G Jefferson etc, but funny how times have changed (we haven’t, times have <: <:)
The ‘new’ hero is somewhat tainted, going back to Tony Soprano, “The Shield” where ‘Vic Mackay a cop, ‘executed’ one of his squad members and was genuinely a ‘hateful’ character but he was the ‘hero’. “Breaking Bad” is another one, “Dexter” “Justified” is on the edge, and “Banshee” is ‘over the edge’. Just a few examples...

That said, I watched “High Noon” yesterday and had really forgotten the ending, where the ONLY “Man” in the town gave a look that would have frozen statues while glaring at the crowd, saying nothing, throwing his badge to the ground and ‘buggying off into the sunset with his bride’.
I was a ‘protected’ teenager and don’t recall when I first saw it but pretty sure I didn’t take the ending the way it should have been taken (at that time).


49 posted on 02/11/2013 12:34:54 PM PST by xrmusn (6/98 "It is virtually impossible to clean the pond as long as the pigs are still crapping in it")
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To: cripplecreek

” Now I’m off to discover why the microwave tray turns one way till I turn the oven off and on again when the tray turns the other way.”

So it’s not just me. I’ve often been perplexed by that also.


50 posted on 02/11/2013 12:54:10 PM PST by Lurkina.n.Learnin (Superciliousness is the essence of Obama)
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