Introduction to electricity and magnetism pdf

Although ferromagnetism is responsible for most of the effects of magnetism encountered in everyday life, all other materials are influenced to some extent by a magnetic field, by several other types of magnetism. The force of a introduction to electricity and magnetism pdf on paramagnetic, diamagnetic, antiferromagnetic materials is usually too weak to be felt, and can be detected only by laboratory instruments, so in everyday life these substances are often described as non-magnetic. A material may exhibit more than one form of magnetism as these variables change. Ancient humans discovered the property of magnetism from lodestone.

A blacksmith holds a piece of red-hot iron in a north-south direction and hammers it as it cools. The magnetic field of the Earth aligns the domains, leaving the iron a weak magnet. Drawing of a medical treatment using magnetic brushes. A lodestone attracts a needle. They sculpted a directional spoon from lodestone in such a way that the handle of the spoon always pointed south. 1187, was the first in Europe to describe the compass and its use for navigation.