https://soh-cah-toa.pages.dev/tags/magnetism/ Recent content in Magnetism on SOH-CAH-TOA Hugo en-us Tue, 18 Aug 2026 22:45:56 +0700 https://soh-cah-toa.pages.dev/guides/physics/magnetism_and_electromagnetism/ Tue, 18 Aug 2026 22:45:56 +0700 https://soh-cah-toa.pages.dev/guides/physics/magnetism_and_electromagnetism/ <h2 id="simple-magnetism">Simple magnetism</h2> <h3 id="poles-and-materials">Poles and materials</h3> <p>Like magnetic poles repel. Unlike poles attract. Magnetic materials can be attracted to a magnet and can become magnetised; non-magnetic materials are not attracted.</p> <p><img alt="Magnetic field lines" loading="lazy" src="https://soh-cah-toa.pages.dev/physics/magnetic_field_lines.png#center"></p> <ul> <li><strong>Soft iron</strong> is easy to magnetise and demagnetise. It is used for temporary magnets and electromagnets.</li> <li><strong>Steel</strong> is harder to magnetise but keeps its magnetism. It is used for permanent magnets.</li> <li><strong>Induced magnetism</strong> occurs when a magnetic material becomes magnetised in an external field. The end nearest a magnet becomes the opposite pole, so the material is attracted.</li> </ul> <h3 id="magnetic-fields">Magnetic fields</h3> <p>A magnetic field is a region where a magnetic pole experiences a force. Field direction is the direction of force on a north pole. Around a bar magnet, field lines go from north to south outside the magnet. They never cross. Lines closer together show a stronger field.</p>