What Are Magnets?

The video explores the concept of magnetism, starting with an introduction to permanent magnets and their properties, such as having two poles and magnetic fields that attract or repel. It then discusses the use of electromagnets in scrap yards, which require electricity to function. The video explains how magnetic resonance imaging (MRI) uses magnetism and radio waves to provide detailed images of the body. It also covers the role of electromagnets in loudspeakers, converting electrical signals into sound. Finally, it highlights Earth's magnetism, explaining how compasses align with the Earth's magnetic field for navigation.

Explain how magnetic resonance imaging (MRI) works.

Why does the Earth act as a magnet?