# Magnetism

## Properties of Magnets

• Magnets attract or repel to iron or materials made with iron
• Attract or repel other magnets
• Point north when swinging freely

## Magnetic Force

The force of a magnet is caused by another magnet or iron. If it is caused by another magnet the poles will either attract or repel. In the picture below it shows just how strong the magnetic force can be. The picture is of how the sun uses it's magnetism to keep the planets orbiting around the sun.

## Magnetic Poles

There are two different poles a of a magnet. The poles are called the north and south. Like poles repel and unlike poles attract. For example, two north poles or two south poles will repel. If you have one north and one south pole the two unlike poles will attract.

## Magnetic Field Lines

The area of force around a magnet is called the magnetic field. Fields have invisible lines that map out the field. distance between these lines determine how strong the force is. If the lines are close together it is a strong field. If they are far apart it is a weak field. An example of a magnetic field is in the picture below.

## Magnetic Domains

A magnetic domain is a field of atoms that are all aligned. Magnetized material has a magnetic domain. Not magnetized material, however, does not. In material that is not magnetized each atom points in a different direction in result of the atoms doing that the magnetic fields cancel each other out.

## Definitions

Magnet: Any material that contains iron or attracts any material with iron

Domain: A field of atoms that are all aligned

Magnetic Pole: Two ends of a magnet where the magnetic force is the strongest

Field Lines: Lines that map out the magnetic field around a magnet