Magnetism

What type of force is magnetism

Non contact just like gravity

What are the three main rules of magnetic field diagrams

Field lines cannot cross

The more dense the field lines, the stronger the field

Field lines point in the direction that a north pole feels a force. From north to south

Diagram for like poles

Diagram for opposite poles

Diagram for uniform field

All same sized gaps

Like poles…..

Repel

Opposite poles….

Attract

Permanent magnets have their domains …….

Aligned

Something non magnetic has how many domains?

None

Explain the domains in a magnetic material

Something magnetic has random domains. These domains temporarily align when a magnetic is near the material.

What happens to the domains in soft magnetic materials when the magnetic is taken away

They lose their magnetism and the domains unalign

What is it called when soft magnets lose their magnetism

Demagnetisation

What happens to the domains in a hard magnetic material when the magnet is removed

The domains are permanently aligned so they stay as they are. They sre permanently magnetised

What is an electromagnet

A magnet made by using electrical currents to create a

Diagram for electromagnetism

Field lines drawn in concentric circles. They get weaker as you move further away

What type of magnetic material are electromagnet made of

Soft magnetic material so they can be turned on and off

What is the most common form of electromagnet

A wire that is coiled around a soft magnetic material. This is a solenoid

What are the 3 ways to increase the strength of an electromagnet

Adding voltage

Increasing number of coils

Use a magnetic coil