What Size Magnet Can Erase a Credit Card?

  • Published on Sep 6, 2018
  • Check out Samy's channel: ru-clip.com/video/UHSFf0Lz1qc/video.html
    Don’t try this at home! The experiments and products shown in this episode were used in the name of science.
    Creator/Host/Writer/Editor: Dianna Cowern
    Editor: Jabril Ashe
    Science Consultant: Dan Walsh
    Videography: Dianna, Jabril and Trace Dominguez
    Thanks to Rachel Cohen for the idea for this video and for her help!
    Thank to Casey Wessel, Demetra Airaudi, and Josh from the farmers’ market.

Comments • 843

  • Zágoni Mátyás

    This emulating tech is used in newer samsung phones for samsung pay.

  • michael
    michael Day ago

    Samsung Pay is a Mag Spoofer

  • Ike Winsor
    Ike Winsor 4 days ago

    samy is my hero

  • John Solo
    John Solo 6 days ago

    Hawaii is 10 years behind? Oh my God, I already wanted to live there, and now I REALLY want to

  • Michael McChesney
    Michael McChesney 9 days ago

    About 30 years ago, I had gone out to a Manhattan club and got scanned at the door by a hand held metal detector. Later after I left, I wanted to catch a cab but needed to get cash from an ATM. But my ATM card wouldn't work. I tried 3 different banks before I realized what must have happened. A metal detector is really a magnet. I ended up taking a long walk that night. The funny thing is the next day, my card worked again.

  • HiddenCards [ CRM ]
    HiddenCards [ CRM ] 11 days ago +4

    Wait, you don't have chips fully implemented?!

  • Royce Valencia
    Royce Valencia 11 days ago

    The new chips are awful. I don't know how they break, but this year alone my chip has stopped reading 6 seperate times. It's breaking every single month just sitting in my wallet on the counter. I've never had the mag strip stop working before ever.

  • adelmo worytko
    adelmo worytko 13 days ago

    Do something with peizo electrical sensors

  • Trenton Pottruff
    Trenton Pottruff 13 days ago

    *laughs in contactless*

    SUPERNOVA 13 days ago +1

    What size magnet do i need to hack the ATM?

  • Vic Rattlehead
    Vic Rattlehead 13 days ago

    I would like to poke her in the fart box

  • Chesseski
    Chesseski 14 days ago

    0.6 mm or 0.02362205 of an inch, which ever makes more sense to you

  • dragoola69x
    dragoola69x 14 days ago

    it had to be a N52 MAGNETS then it will kill a card if it was a ceramic refrigerator magnet of the same size it would have done NOTHING.

  • ryan olson
    ryan olson 15 days ago

    All of this is why I alternate my cards up and down in my wallet to keep the strips separated just in case.

  • ryan olson
    ryan olson 15 days ago

    Putting a link to the mag spoof is probably not going to be the best idea.

  • ryan olson
    ryan olson 15 days ago +2

    "why do you have all these credit card manufacturing machines?" "Research" lol

  • ryan olson
    ryan olson 15 days ago +1

    The physics girl been SHOOKETH!

  • Ailee Pham
    Ailee Pham 15 days ago +1

    6:57 that's Jacob at the back?

  • Tàpai Ferenc
    Tàpai Ferenc 17 days ago

    I woud like my kard have yust dark number feri.

  • Tàpai Ferenc
    Tàpai Ferenc 17 days ago

    I think you too much idealist hawe!

  • Alex Landherr
    Alex Landherr 18 days ago +2

    How do I convert from Gauss to Tesla?

  • Note Hermelin139
    Note Hermelin139 19 days ago

    I think that the safest way to pay ist still with ordinary cash from your wallet, nobody can magnetise or hack cash

  • Alex Wilson
    Alex Wilson 22 days ago +1

    No one gonna talk about the fact that he showed his credit card in this video?

    • Tyler Murray
      Tyler Murray 21 day ago

      i was just about to say is anyone else concerned

  • William Chao
    William Chao 26 days ago

    Are the mag spoof made by Huawei?

  • Samuel Varner
    Samuel Varner 26 days ago

    Sammy is my hero

  • Richard KJfourVGV
    Richard KJfourVGV 27 days ago


  • Reckless Roges
    Reckless Roges 27 days ago

    The chip-n-pin has nothing to do with security, Its all about pushing accountability from the credit card company back to the customer.

  • Paxmax
    Paxmax Month ago +1

    I wish I wouldn't become so annoyed with valley girl cadence Geez frick, I had to watch the square part twice, got so lost in "wwwhyyyy the frick are you talking like I am some special needs guy who needs long positive pauses to keep up?!?" Same with Lindsey Sheppard, smart cookie but her cadence gaaaah.

  • Lucas van Hout
    Lucas van Hout Month ago

    2:03 I have a case like that too. It is a mouse case.

  • TerribleTonyShow
    TerribleTonyShow Month ago

    5:15 nice shirt bud

  • Roger Hao Zheng
    Roger Hao Zheng Month ago

    Samsung has this feature on their phones now

  • Emerald
    Emerald Month ago

    The did surgery on a chip...

  • Nora B
    Nora B Month ago

    What is the device this dude use on his phone

  • flufflepufflover
    flufflepufflover Month ago

    'How to hack credit cards'

  • Andrew van Baarsen
    Andrew van Baarsen Month ago

    Shout out to farmer josh
    dude seems cool

  • 4am Curiosity
    4am Curiosity Month ago

    So did they actually ruin their credit cards for this?? Someone tell me

  • Natalia Ray
    Natalia Ray Month ago

    chips became a thing cause they are delicious

  • Lemnai Wangnaw Lemnu

    I love you.

  • Justin G
    Justin G Month ago


  • md wahid Sadiq
    md wahid Sadiq Month ago

    you cant be physics girl if you use iphone

  • Cyberdyne Systems: Skynet

    I'm supposed to be building and testing a SQL database for a final...but I found a girl who talks about science on RU-clip and it's sooo coool!

  • John Doe
    John Doe 2 months ago

    What’s the physics of why I’m in love with you?

  • The Macrobian Nomad
    The Macrobian Nomad 2 months ago

    Gosh America is so behind, I was using my first ever bank card which was chip and pin back in 2005, and they say us Brits are behind 🙃

  • Badhon Ebrahim
    Badhon Ebrahim 2 months ago

    10 years back sound awesome,sounds exactly where i want to be

  • Joseph Figueroa
    Joseph Figueroa 2 months ago

    Hey u were supposed to put the answer to the last video's last riddle... So sad

  • Zen = Yen 🔴
    Zen = Yen 🔴 2 months ago

    I use Samsung pay to touch vendors cc machine and pay.
    no more plastic cards to swipe or damage

  • Rob Spencer
    Rob Spencer 2 months ago

    I wonder how many gauss an EV motor like in a Tesla are capable of producing to get the kind of torque they create.

  • Ahsan khan
    Ahsan khan 3 months ago

    hey i love you

  • That One Slayer Fan
    That One Slayer Fan 3 months ago

    This was actually completely cool! Great video, and shoutout to Jabrilsssss

  • Kendall Kessler
    Kendall Kessler 4 months ago

    Interesting! I definitely will not try this at hom.

  • Wael Fdhila
    Wael Fdhila 4 months ago

    An important forgotten point is that chip enabled cards, when swiped have a bit in its data that is set to "1" letting the machine know its chip enabled and requires you to use the chip, unless the reader itself doesn't have one so the transaction goes through. A user with a reader could read the strip data, edit the "1" to "0", so when the card is swiped the reader thinks its not chip enabled and thus allows the transaction regardless.

  • Sean Cannon
    Sean Cannon 4 months ago

    Switch to chips to increase security... but don't stop using magstrips because the chips fail quickly with the technology we're using...
    I feel like somebody wanting to use your card would just program the magstrip onto another card, then scratch the chip on the other card... Then they run it 3 times with the chip failing, and run the old method...

  • Polina Nikulina
    Polina Nikulina 4 months ago +2

    i went here to see if anyone had aknowledged how cool that farmers market dude looks

  • richard klegin
    richard klegin 4 months ago

    Chip n card isnt sercure .lol

  • Dos Caffeine
    Dos Caffeine 5 months ago

    Debate of the century: chip or magnetic stripe?

  • Vincent Ly
    Vincent Ly 5 months ago

    Where is the answer to the angle riddle you said in the last video? You said that you would put the answer in the next video. I looked in the description of this video, but it is not there.

  • Michael Kloepfer
    Michael Kloepfer 5 months ago

    hopefully his bank has a really cheap swipe fee

  • JerseyDevil26
    JerseyDevil26 5 months ago

    The PB farmers market!

  • Dark Suns
    Dark Suns 6 months ago

    I heard your husband got hit by a train.

  • Scott Krumwiede
    Scott Krumwiede 6 months ago

    Try a Neodymium magnet, it will scramble any card!!!!

  • Chris Phillips
    Chris Phillips 6 months ago

    Chip and contactless cards are not secure. Contactless is particularly susceptible to abuse. As for needing millions of dollars of equipment to "hack" the chip, absolutely ridiculous. Both methods are mildly more secure than mag stripe, but only barely. They are, however, rendered completely insecure either way due to the fact that mag stripe is still included on all cards!

  • Ajaz bhatt
    Ajaz bhatt 6 months ago +1

    My card had been erased mistakenly recently by a pea size magnet... Jeeez it was horrific

  • Aldo Game
    Aldo Game 6 months ago +1


    • Aldo Game
      Aldo Game 6 months ago +1


  • hellhound713
    hellhound713 6 months ago

    My question is can one credit card magnetic strip erase another credit card magnetic strip?

  • Rup Ganguly
    Rup Ganguly 6 months ago

    Physics girl : Uhhh..... Why do have all the equipment to perform an online robbery?
    Sammy : Uhhhhhhh........ RESEARCH !!!!

  • KvaGram
    KvaGram 6 months ago

    Contact-less? You mean those things we have had a few years here in Norway, where you just put the card next to the machine to pay?
    You think those are secure?
    Well then, I'll see you in the subway with a payment machine, just innocently moving it around your pockets.

  • india atkin
    india atkin 7 months ago

    Somewhere, billionaire businessmen are weeping into their ties...
    _"I spent my life building an empire and all i needed to build was a magspoof"_ 😭

  • Dmitri Ruban
    Dmitri Ruban 7 months ago

    Rust is actually iron hydroxyde. Also, electric and magnetic fields are not the same because electric fields are created by static charges and magnetic fields - by charges in motion. Finally to the point: many cards feature both chip and magnetic stripe making them vulnerable even if only chip is used because malevolent persons can place stripe reader in the slot where card is inserted to use its chip.

  • Jatin Kumar
    Jatin Kumar 7 months ago

    Great Video

  • Midnight's Ocean
    Midnight's Ocean 7 months ago

    It's amazing. With all the magnets all around all these years, I've never had a single magnetic card get damaged.

  • Norman Reitzel
    Norman Reitzel 7 months ago +2

    I worked with multi-tesla NMR spectrometers and have had experience with erased credit cards. You should know that mag-stripes come in two flavors, low coercivity (natively brown) and high coercivity (natively black). The Hi-Co cards are a lot more resistant to large fields. Very small fields (like your first magnet) have high dB/dt and are really good at erasing mag stripes. Loved the video!

  • yandyyay
    yandyyay 7 months ago

    well duh... magnet in direct contact with the mag strip.... did you seriously expect it not to corrupt / erase it ?

  • When Death Declares War

    Oh my, that guys style, why is no one talking about it.

  • trance dj
    trance dj 7 months ago +1

    i think the chip lady was full of it. otherwise they wouldn't make rf id blocking wallets, etc.. there are rf id skimmers to people just need to get close enough to you to get it. prob easier than a conventional skimmer.

    • trance dj
      trance dj 5 months ago

      @Nobody Knows better than nothing i suppose

    • Nobody Knows
      Nobody Knows 5 months ago

      You really think that wallet you bought in the "as seen on tv" section of walmart protects you?

  • Fraiz
    Fraiz 7 months ago

    "But most of all, Samy is my hero"

  • PaladinKnight20
    PaladinKnight20 7 months ago

    I love Samy Kamkar!

  • Mr. Boma's Balloons
    Mr. Boma's Balloons 7 months ago

    Why not eat the iron? We need iron in our diet.

  • Kooji Nguyen
    Kooji Nguyen 7 months ago

    Did he just show us out credit card number?

  • Brad Johnson
    Brad Johnson 8 months ago

    The guy said damn now they’re not gonna buy Anything

  • i minabrons
    i minabrons 8 months ago

    What a creepy parasite that woman is.

  • Brian Evolved
    Brian Evolved 8 months ago

    how about erasing the chip

  • 88HD
    88HD 8 months ago

    The mag spoof device is how Samsung phones work with any credit card machine.

  • HamStuff
    HamStuff 8 months ago

    Hawaii is 10 years behind? More like 20. I've been around for 2 and a half decades and chips have been around for as long as I can remember.

  • noisywan
    noisywan 8 months ago

    Why don't they switch to optical if the magnet stripe data is just static barcode data? I know chips are taking over and stripe thing is obsolete but they still put magstripes today on the cards as a secondary method. Why not optical?

  • Chris
    Chris 8 months ago

    The Samsung Note 8 actually has something like magspoof built in, they just never promoted it. Pretty rad.

  • Mandogy - Games
    Mandogy - Games 8 months ago

    So what your saying is, I can mod my bus card for free rides?

  • ThisJustyn
    ThisJustyn 8 months ago

    Starset 🤘🏻 nice!

  • oljak4
    oljak4 8 months ago

    I don't know if you have any experience with Samsung Pay, but this is what Samsung phones use for its contactless payment. That's why it can work pretty much anywhere, because it changes the magnetic field to make a card swiper think a card has been swiped. Really cool video though, I understood how Samsung Pay worked but the part where you stuck the particles to the credit card really helped visualize why it's ultimately possible!

  • arisuki
    arisuki 8 months ago

    I’m from Chile and we made the move to chips and contactless tech few years ago, and our bus/metro pass has always been contactless. However, watching this video I’ve remembered the time I “deleted” the info on my pass by keeping both my phone and pass in the same tight pocket. Also last year there was a huge issue with contactless tech here bc the range in which the card could be read (by different devices) was wider than expected (card-kept-in-a-wallet-inside-a-bag wide). So it might be fun to find other culprits on our damaged cards!

  • memeandmyself
    memeandmyself 8 months ago

    What about the long term effect of exposing the magnetic strip for long periods of time to weak magnetic fields, like the speakers of a tablet in a suitcase or the magnetic lock of a purse and so on?

  • CC Oosting
    CC Oosting 8 months ago

    Also, in France/Spain they use the magnetstrip for the toll roads and like everywhere in the Europe Union they banned using the magnetstrip for reals.

  • NovaComputing
    NovaComputing 8 months ago +1

    Why does the woman from square ask so many questions? Shouldn't she know the answer?

    • trance dj
      trance dj 7 months ago +1

      no. she also said nothing about rf id skimmers. oh yeah she works for the chip people.

  • Dan Hoke
    Dan Hoke 8 months ago

    I literally opened my mouth in "woaaaaah" when he pulled the card out of the iron fines with stripes on it.

  • Ram
    Ram 8 months ago

    "Did you erase your card because you were curious? Don't worry, we'll make you a new one on the spot'' TD Banks: Supporting your criminal achievements.

  • Sprightly M
    Sprightly M 8 months ago +3

    What size of magnet do I need to attract you Physics Girl?

  • uwu! Eugy7
    uwu! Eugy7 8 months ago

    "The reason I was so *_shooketh_* "

  • aadarsh hanuman
    aadarsh hanuman 8 months ago

    Hey Dianna! Just wanna say ur face looks like my aunt’s

  • Timothy Rodowicz
    Timothy Rodowicz 8 months ago

    Why is everyone working with this guy? Did he do something recently to become relevant? Myspace hasn't been a thing in like 12 years

  • YoshiPeach Mario
    YoshiPeach Mario 8 months ago

    hang on, you made the card unreadable because you scratched the stripe with the magnet, not because the magnet wiped the data on its own (for the first one anyway)

  • Ackurus
    Ackurus 8 months ago

    Given this information for maximum security: cover the CC number, expiration, CCV, then erase the magstripe, and then the only way to exploit the card would be to physically posses it.