Magnets

Do opposite poles attract or repel

Attract

Do like poles attract or repel

Repel

N+S - would this attract or repel

Attract

3 magnetic materials

Iron, cobalt, nickel

What makes up a hard magnetic material

Make permanent magnets

Retain their magnetism over a long period of time

They are hard to demagnetise

Soft magnetic materials

Quickly gain their magnetism

Quickly lose their magnetism

Do not retain their magnetism - temporary magnets

What is a uniform magnetic field

Where two magnets are next to each other with opposite poles

Where do field lines always point from

North towards south

How do field lines go around a wire

In a circular motion

3 components to make a powerful electromagnet

A coil that will produce a concentrated field inside

A current flowing through a coil

A soft magnetic material core inside of the coil that will be magnetised when the current is turn on and then demagnetise when the current is turned off

What does

C

C

C

Stand for

Coil

Current

Core