Magnetism, a tangible manifestation of electricity, has played a pivotal role in our understanding of the physical world. Its roots can be traced back billions of years to the formation of the Earth, when swirling electrical currents within the molten core created magnetic fields. As the magma solidified, iron-bearing minerals such as magnetite retained a magnetic imprint.
The magnetic field of the Earth is a testament to this ancient magnetism. It extends far into space, influencing the behavior of charged particles and providing a navigational guide for migratory animals. While invisible to our senses, it leaves its mark on the Earth’s crust, influencing the alignment of magnetic iron atoms in rocks.
The discovery of magnetism is shrouded in legend. Ancient Greek shepherds and sailors are said to have encountered magnetic rocks that attracted iron objects. These rocks, known as lodestones or magnetite, gave rise to the term ‘magnet.’ By the Iron Age, the phenomenon of magnetism was widely recognized, with lightning strikes and smelting processes revealing the magnetic properties of iron.
The unique characteristics of magnetism have fascinated scientists throughout history. In the sixteenth century, travelers from East India and China reported on magnetic stones with remarkable strength. As knowledge of magnetism spread, the names ‘Magnes rock’ and ‘magnet’ evolved from their Greek and Latin roots.
Today, magnetism continues to hold scientific interest, with ongoing research exploring its fundamental nature and applications in various fields. Frank Close, in his insightful book, provides a deeper dive into the subatomic world, unraveling the mysteries of magnetism and its profound implications for our understanding of the universe.
