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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.

Discussions

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LasVegas
LasVegas

13 years ago

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

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Punkguyta
Punkguyta

Reply 13 years ago

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

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trebuchet03
trebuchet03

13 years ago

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

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zachninme
zachninme

Reply 13 years ago

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.

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zachninme
zachninme

Reply 13 years ago

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.

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carbon
carbon

Reply 13 years ago

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.

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icanryme2002
icanryme2002

Reply 13 years ago

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

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PointyOintment
PointyOintment

Reply 13 years ago

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

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trebuchet03
trebuchet03

Reply 13 years ago

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

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trebuchet03
trebuchet03

Reply 13 years ago

Field strength is not a linear relationship ;)

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zachninme
zachninme

Reply 13 years ago

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

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PointyOintment
PointyOintment

13 years ago

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

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Crash2108
Crash2108

Reply 13 years ago

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

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LasVegas
LasVegas

Reply 13 years ago

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.

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PointyOintment
PointyOintment

13 years ago

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

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zachninme
zachninme

Reply 13 years ago

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