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  2. Do magnets affect credit cards? - AOL

    www.aol.com/finance/magnets-affect-credit-cards...

    Learn about how magnets can damage your credit card’s magnetic strip. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways ...

  3. Superconducting magnet - Wikipedia

    en.wikipedia.org/wiki/Superconducting_magnet

    The magnet is inside the doughnut-shaped housing and can create a 3-tesla field inside the central hole. Superconducting magnets have a number of advantages over resistive electromagnets. They can generate much stronger magnetic fields than ferromagnetic-core electromagnets, which are limited to fields of around 2 T.

  4. Magnetic deviation - Wikipedia

    en.wikipedia.org/wiki/Magnetic_deviation

    A sample compass correction card, showing the deviation correction for a given heading. Once the compass has been corrected using small magnets fitted in the base and with soft iron balls, any residual deviation is recorded as a table or graph: the compass correction card, which is kept on board near the compass.

  5. Access badge - Wikipedia

    en.wikipedia.org/wiki/Access_badge

    A private security officer with an access card/ID card. An access badge is a credential used to gain entry to an area having automated access control entry points. Entry points may be doors, turnstiles, parking gates or other barriers. Access badges use various technologies to identify the holder of the badge to an access control system.

  6. Punched card - Wikipedia

    en.wikipedia.org/wiki/Punched_card

    Punched card. A 12-row/80-column IBM punched card from the mid-twentieth century. A punched card (also punch card [1] or punched-card [2]) is a piece of card stock that stores digital data using punched holes. Punched cards were once common in data processing and the control of automated machines . Punched cards were widely used in the 20th ...

  7. Magnetic-core memory - Wikipedia

    en.wikipedia.org/wiki/Magnetic-core_memory

    t. e. Magnetic-core memory is a form of random-access computer memory. It predominated for roughly 20 years between 1955 and 1975, and is often just called core memory, or, informally, core . Core memory uses toroids (rings) of a hard magnetic material (usually a semi-hard ferrite ). Each core stores one bit of information.

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