MagnetismMagnetism

MagnetsMagnets Any material that creates a magnetic fieldAny material that creates a magnetic field

– Some materials can be made into permanent Some materials can be made into permanent magnets.magnets. Hard magnetic material- difficult to magnetize but Hard magnetic material- difficult to magnetize but

hold the magnetism.hold the magnetism. Soft magnetic material- easy to magnetize but lose Soft magnetic material- easy to magnetize but lose

magnetism easily.magnetism easily.

– Magnets exert magnetic force on each other.Magnets exert magnetic force on each other.

Magnetic polesMagnetic poles- one of 2 points (end) - one of 2 points (end) of the magnet that have opposing of the magnet that have opposing magnetic properties.magnetic properties.

– Like poles repel, and opposite poles Like poles repel, and opposite poles attractattract

Magnetic FieldsMagnetic Fields

Magnetic FieldsMagnetic Fields- a region where a - a region where a magnetic force can be detected. magnetic force can be detected. Created by magnets.Created by magnets.

Compasses can track magnetic fields.Compasses can track magnetic fields.

Earth’s magnetic field is like that of a Earth’s magnetic field is like that of a bar magnet.bar magnet.

Magnetism from Electric Magnetism from Electric CurrentsCurrents

1820- Danish science teacher, 1820- Danish science teacher, Hans Christian Oersted found Hans Christian Oersted found that magnetism is produced that magnetism is produced by moving electric charges.by moving electric charges.

Actually- it’s the moving Actually- it’s the moving electrons around the nucleus electrons around the nucleus of an atom that make the of an atom that make the magnetic field.magnetic field.

Electric Currents from Electric Currents from MagnetismMagnetism

1831- 1831- Michael Faraday Michael Faraday discovered that a current can discovered that a current can be produced by pushing a be produced by pushing a magnet through a coil of wire magnet through a coil of wire (moving in and out)- causing charges (moving in and out)- causing charges in the wire to move = current.in the wire to move = current.

FARADAY’S LAWFARADAY’S LAW: An : An electric current can be electric current can be produced in a circuit by a produced in a circuit by a changing magnetic field.changing magnetic field.