Earth Science: Physics and Technology – Electromagnetism Gravity-the fact that all objects attract each other in proportion to their mass—is familiar to everyone. In fact, life without it can hardly be imagined. Electricity and magnetism are different; even through the early 19th-century phenomena such as naturally magnetic minerals were scarcely known and not understood. Earth … Read more
Facts At Your Fingertips: Energy and forces – Electromagnetism An electrical current always produces a magnetic field around it. Electromagnets are made by passing electricity through a wire that has been wrapped around a piece of iron. Unlike permanent magnets, an electromagnet loses its magnetism as soon as the electrical current is switched off. How … Read more
Facts At Your Fingertips: Energy and forces – Magnetism Magnetism is a force that can attract (pull toward) or repel (push away). Materials that are strongly attracted to magnets, such as iron or nickel, are called ferromagnetic materials. Some magnets are permanently charged with magnetism, while others are only magnetic when they are inside a … Read more
