Magnets and Electromagnetism (Physical Science in Depth)

How does magnetism help birds find their way home? How do magnets help power your computer? What distant objects have the strongest magnetic fields in the universe? This title looks at the fascinating properties of objects that repel and attract one another. The book explores the magnetic universe and how the magnetic nature of our planet gives clues about its past. It also examines electromagnetism, the special force that helps power most of the machines we use each day.