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Basic Magnetic Properties Magnets are fun to play with.

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Presentation on theme: "Basic Magnetic Properties Magnets are fun to play with."— Presentation transcript:

1 Basic Magnetic Properties Magnets are fun to play with.

2 Magnetic materials Certain materials are magnetic or can retain magnetic properties. These include iron, nickel, and cobalt. Certain materials are magnetic or can retain magnetic properties. These include iron, nickel, and cobalt. Magnetic materials were originally found in the ground. Magnetic materials were originally found in the ground. Today magnets are made by placing materials in a strong magnetic field Today magnets are made by placing materials in a strong magnetic field

3 The Poles Magnets have a North and South pole Magnets have a North and South pole The Poles exist together in pairs, cant separate a North from a South The Poles exist together in pairs, cant separate a North from a South

4 Magnetic field lines Field lines leave the North and enter the south Field lines leave the North and enter the south A compass (which is a magnet) aligns itself with the North pointing in the direction of the magnetic field lines A compass (which is a magnet) aligns itself with the North pointing in the direction of the magnetic field lines

5 Making Magnets Magnets are made by placing magnetic materials in a strong magnetic field Magnets are made by placing magnetic materials in a strong magnetic field In these materials the little magnetic dipoles all line up, creating a North at one end and a South at the other. In these materials the little magnetic dipoles all line up, creating a North at one end and a South at the other.

6 Why does magnetism exist? Magnetism exists because moving charges create magnetic fields. Magnetism exists because moving charges create magnetic fields. These moving charges create little baby magnets inside the material. When all these little baby magnets line up, they create one big magnet These moving charges create little baby magnets inside the material. When all these little baby magnets line up, they create one big magnet

7 Break a magnet in half? Breaking a magnet in half just creates two smaller magnets Breaking a magnet in half just creates two smaller magnets

8 Earths magnetic field The earth has a magnetic field. The earth has a magnetic field. A compass aligns itself with this field, with the North side of the compass point towards the magnetic South. A compass aligns itself with this field, with the North side of the compass point towards the magnetic South. We call the North pole the North pole because the North on the compass points in this direction. We call the North pole the North pole because the North on the compass points in this direction. The North Pole is actually magnetically South The North Pole is actually magnetically South There is evidence that every few gazillion years the poles reverse. There is evidence that every few gazillion years the poles reverse. The magnetic fields are important for our survival as they deflect charged particles flying at us from the sun. The magnetic fields are important for our survival as they deflect charged particles flying at us from the sun.

9 Earths magnetic field


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