Magnetism

principle · 600 BC · Ancient world

The attraction and repulsion of magnets; the Earth’s magnetic field.

Where it is used

• Compass — is used in. The needle aligns with the Earth’s magnetic field.
• Hall sensor — is used in. It responds to a magnetic field.
• Magnetic-core memory — is used in. The magnetization of the rings.
• Magnetic tape — is used in. Recording by magnetization.
• Hard disk drive — is used in. Magnetic recording.
• Floppy disk — is used in. Magnetic recording.
• Payment card — is used in. A magnetic stripe.
• Permanent magnet — is used in. A permanent field.
• Lodestone — is used in. A natural magnet.

History: what it evolved from and what it influenced

• Electromagnetism — evolved into. Ørsted linked magnetism with current.

Open Evothings