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# Cell Phone + Magnet Answered

I was playing around with some of my 1/8in. NeFeBr (or is it NeBrFe?) magnets leftover from the challenge. Was using them to find screws on my flip phone. I noticed that when I put it at the "joint" of the two halves, the screen went dark. Turns out it thought I shut my phone. This was just a little odd tidbit that I wanted to share, that has potental. But, it isn't an instructable, so I just posted it.

## 16 Replies

LasVegas (author)2007-01-04

Nope. Unless, of course, your cell phone is using '70s technology Core memory or floppy disks...

Punkguyta (author)2007-02-08

Mine does, it's the size of a microwave :-)

trebuchet03 (author)2006-10-25

wow, thanks for sharing... I just grabbed one of my magnet building toys... I have some sort of samsung phone... if I place the magnet on the button half (its a flip phone), in the right place it thinks I closed the phone...

Oooo... looks like there's also a magnet on the other half... so I guess its a reed switch.

AND - it will end a phone call :P

Nice find

zachninme (author)2006-10-25

Yeah, I figured it was. Thanks! I'm glad I could contribute. With a large magnet, you could probably "close" a phone from quite a distance away.

zachninme (author)2006-10-25

As a referance, the magnets I have have a pull force of .9lbs, and work from 1cm away.
That is 2kg = 1cm
(fine, 1.98km)
If it is a linear relation, then this magnet should work from 23.5 feet away.

With obsructions and such, I would guess 20 feet, that is still amazing
The point of that is to "close a phone" from afar.

carbon (author)2007-01-03

So....if I get a large enough magnet, I could go on anti-cell-phone raids? Wait a minute!- I already have a 1.5inch n48 neodymium cube of dooooooom! It has the strength to "close" a phone from a little over a foot away. It's very, very satisfying to sneak up behind someone, wave it over their phone, and pity the mere mortal as they say something along the lines of: "Hello...Hello?...Are you there?...How strange- I appear to have lost the call...I guess I'll have to dial them up again...Oh dang!- I lost it again!..." Repeat as necessary.

icanryme2002 (author)2007-02-08

get one of those big magnets used for pulling outboards from the bottom of a lake

PointyOintment (author)2007-01-02

It's something like the square of the distance...?

trebuchet03 (author)2007-01-04

Not Squared -- inverse cube. So, if we double the distance the magnetic field is 1 eighth as strong.

trebuchet03 (author)2006-10-25

Field strength is not a linear relationship ;)

zachninme (author)2006-10-26

Figured... Ah well, it would still be far!

PointyOintment (author)2006-10-27

Nice discovery. This would probably also work on my MacBook, which uses magnets to stay closed. Btw, it's NdFeB, Neodymium-Iron-Boron.

Crash2108 (author)2006-10-27

Be sure to wave that magnet around the hard drive and the screen while you are at it..

LasVegas (author)2007-01-03

The hard drive is sufficiently shielded and an LCD display is unaffected by magnetic fields. A magnet short of a very, very strong super magnet would have no effect on modern notebook computers. BTW: Other than the magnet in the hard drive, there are normally two magnets in most Macintosh notebooks. One pulls the latch out of the screen frame when it's closing and the other triggers a reed switch when the cover's closed to put the computer to sleep.

PointyOintment (author)2007-01-02

>NeFeBr (or is it NeBrFe?) magnets Neodymium-Iron-Boron, therefore NdFeB. :)

zachninme (author)2007-01-03

Thanks, I guess I need to study my element abbreviations! :P