Section 3

Electricity and Magnetism

Quick SummaryA magnet attracts other things made

of iron, steel, and certain other materials.A magnet is surrounded by an invisible

magnetic field.All magnets have two poles with opposite

charges.

Electricity and Magnetism

Vocabulary

Magnetism

Magnetic Field

Electricity and Magnetism

What is the structure of a magnet?What are the similarities and differences

between the north and south poles of a magnet?

If you find a metal bar, how can you determine if it is a magnet?

Electricity and Magnetism

If you break a magnet into two pieces, what happens to its magnetic poles?

Use the Internet or other resources to locate places other than Magnesia where lodestone is found.

Electricity and Magnetism

Quick SummaryEarth is surrounded by a huge magnetic field.The needle of a compass aligns north-south so

that one end points to Earth's magnetic north pole and the other end points to Earth's magnetic south pole.

An aurora is caused by charged particles from the Sun being attracted to Earth's magnetic poles.

Electricity and Magnetism

How does a compass work?Where are Earth's magnetic forces strongest?How does the existence of auroras on Jupiter provide

evidence for Jupiter's magnetic field? Explain.What are some ways that Earth is like a magnet?Why does a compass needle point in a north-south

direction?Expository Compasses can be used to create treasure

hunts. Hide a small object. Then write clues on index cards. Hide all but the first clue, which tells how to use a compass to find the next clue, and so on. Challenge a friend to use your directions to find the hidden object.

Electricity and Magnetism