MagnetismMagnetism Attractive and Repulsive Attractive and Repulsive

What Is A Magnet?What Is A Magnet?•MagnetMagnet: any object that attracts : any object that attracts iron or materials containing iron iron or materials containing iron

1. Two poles1. Two poles

2. Exert forces2. Exert forces

3.3. Surrounded by aSurrounded by a magnetic fieldmagnetic field

Magnetic PolesMagnetic Poles• Every magnet has Every magnet has twotwo poles poles

The parts of a magnet where the The parts of a magnet where the magnetic effects are the greatestmagnetic effects are the greatest

Magnetic ForcesMagnetic Forces• The force of repulsion or attraction The force of repulsion or attraction

between the poles of magnetsbetween the poles of magnets

Magnetic FieldsMagnetic Fields• Exist in the region around a Exist in the region around a

magnet in which magnetic magnet in which magnetic forces can actforces can act

Simulated Simulated Magnetic Magnetic

Field Field DrawingDrawing

Actual Iron Actual Iron Filling Filling

BehaviorBehavior

Half a Magnet? Half a Magnet? • What happens if you cut a What happens if you cut a

magnet into pieces?magnet into pieces?

ElectromagnetismElectromagnetism

• The interaction between The interaction between

electricity and magnetismelectricity and magnetism

SolenoidsSolenoids• A coil of wire that produces a A coil of wire that produces a

magnetic field when carrying magnetic field when carrying an electric currentan electric current

ElectromagnetsElectromagnets• Magnet that contains a solenoid Magnet that contains a solenoid

wrapped around an iron corewrapped around an iron core

Hundreds of times stronger due to Hundreds of times stronger due to the combined magnetism of the the combined magnetism of the

solenoid and the iron coresolenoid and the iron core