Daniel and Kelly’s Extraordinary Universe The Mysteries of Magnetism
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Sep 23, 2025 Dive into the captivating world of magnetism! Explore how electricity and electron spin create everyday magnets. Discover the fascinating workings of electromagnets and the quest for elusive magnetic monopoles. Learn about Earth's magnetic field and its dynamic geodynamo. Unravel the mysteries of magnetic phenomena that shape our universe.
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Electromagnetism Is One Unified Force
- Magnetism and electricity are two aspects of the same electromagnetic phenomenon, tightly linked by Maxwell's equations.
- Moving electric charges produce magnetic fields, which always form closed loops and produce dipoles, not monopoles.
No Observed Magnetic Monopoles
- We have never observed isolated magnetic monopoles despite theoretical reasons to expect them.
- All known magnetic fields arise from electric charges in motion and form dipoles with no isolated north or south sources.
Permanent Magnets From Aligned Spins
- Permanent magnets arise from aligned quantum magnetic moments of electrons (spin) and other particles inside materials.
- Magnetic domains cancel when random but produce strong net fields when domains align to add coherently.