Here's why:
* Credit card data storage: Credit card information is stored on a magnetic stripe on the back of the card. This stripe is coated with a magnetic material, similar to the one found on an old cassette tape.
* Writing data: Data is written onto the stripe using a magnetic head, which is essentially an electromagnet. This head creates a magnetic field that aligns tiny magnetic particles on the stripe, representing the data.
* Reading data: When you swipe your card, the same magnetic head reads the data by detecting the magnetic field created by the particles on the stripe.
In summary: Electromagnets are crucial for writing and reading data on the magnetic stripe of a credit card, but they are not used to transfer data onto the card. The data is permanently written onto the stripe during the manufacturing process.
