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This review is from: Magnetism: A Very Short Introduction (Very Short Introductions) (Paperback)
This book demystifies magnetism and presents the development history leading up to unification of electricity and magnetism. It also covers applications of magnetism and the magnetic field of our Earth and Solar System.
Magnetism has a deep association with electricity, relativity and quantum theory. Magnetic field appears in nature when a charge is moving with respect to the observer; magnetism is a purely relativistic effect. Magnetic properties of materials can be explained by quantum mechanics. Electrons either spin one way or the other; it is electron spin that produces magnetism.
Magnetism is vital in our maritime, industrial and information revolutions as well as magnetic navigation in animals. The fusion reactors would one day solve the Earth's energy crisis. The Earth's magnetic field has changed and even reversed over time!