Magnetism The properties and interactions of magnets.
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Transcript of Magnetism The properties and interactions of magnets.
MagnetismThe properties and interactions of magnets
MagnetismWhat You’ll learn
◦Explain how a magnet exerts a force.◦Describe the properties of temporary
and permanent magnets.◦Explain why some materials are
magnetic and some are not.
Magnetic ForcesMagnets either attract or repel.The strength of the force
between two magnets increases as magnets move closer together and decreases as the magnets move farther apart.
Magnetic FieldStrongest close to the magnet
and weaker far awayRepresented by magnetic field
linesHas a direction
Magnetic PolesAll magnets have a north pole
and south pole.Magnetic field lines always
connect the north pole and the south pole of a magnet.
Magnetic poles repel each other and unlike poles attract each other.
Magnetic Field DirectionCompass needle – small bar
magnet with a north pole and south pole
Needle rotates until it lines up the magnetic field lines
The north pole of a compass points in the direction of the magnetic field which is always away from a north magnetic pole and toward a south magnetic pole.
Magnetic MaterialsOnly iron, cobalt, or nickel are
attracted to magnets or made into permanent magnets
Electrons have magnetic properties.
Magnetic DomainsIn a metal, the poles of the
domain are arranged randomly and pointing in different directions.
If place next to a magnet, the atoms are arranged in the direction of the nearby magnetic field
Permanent MagnetMade by placing a magnetic
material in a strong magnetic field.
The magnetic field causes the magnetic domains to line up.
Loss of MagnetismHeat
◦Causes atoms in the magnet to move faster
Dropping the magnet