Earth’s Magnetic Field Chapter 14 Lesson 3

A magnet is any material that attracts iron and materials that contain iron. What is a Magnet?

Magnetic Poles Any magnet has two ends, a north and a south pole. Magnetic poles that are alike repel each other. Magnetic poles that are unalike attract each other. Remember: “Opposites Attract!” Where is the magnetic force is the strongest? At the poles Magnetic Poles

The area of magnetic force around the magnet is known as its magnetic field. The field lines form loops from pole to pole, and never cross. Magnetic Field

Use the provided magnets and ziplock bag of iron filings to view the magnetic field. Where are most of the iron filings at? What does this tell you about the strength of the magnet? Test the theory of attraction and repulsion of the North and South poles. Magnetic Activity

Earth’s Magnetic Field Just like a bar magnet, Earth has a magnetic field around it and two magnetic poles. Compasses are devices that have a magnetic needle that spins freely. Earth’s Magnetic Field

Earth’s Magnetic Field Earth has a magnetic field because of the outer core (liquid iron) and inner core (solid iron) moving at different speeds. Earth’s Magnetic Field

Earth’s Magnetic Field The magnetic poles are not in the same place as the geographic poles. The difference (angle) between the geographic north pole and the magnetic pole is known as magnetic declination. Earth’s Magnetic Field

Earth’s Protection

Earth’s Magnetic Field

Electricity and Magnetism