UNIT 9: MAGNETISM
Unit 9.1: Magnetism
Unit 9.2: The Earth as a giant magnet
Unit 9.3: Electromagnets
Unit 9.4: Investigating electromagnets
What is a mangnet
Magnetic fields
Definition of manetic field
Where is the magnetic field?
The level of mafnetic field
How to detect the magnetic field
Magnetic field lines
The role of the magnetic field
The rules of drawing magnetic field lines
Magnetic field interacting
The forces between two magnets
Draw the magnetic line between
2 magnets when their opposite poles are together
2 magnets when their like poles are together
The invention of the magnetic compass
What is the magnetic north and where is it now?
The role of the compass wtih human?
Draw the magnetic field line of Earth
The origin of the Earth's magnetic field
Properties of magnetic materials
Electromagnets
How is an electromagnet made
Poles of an electromagnet
How to fiind out which poles
How to reverse the poles ò an electromagnet?
Application of electromagnets
Fire door
MRI scanner
Sorting scrap metal
A toaster
Electric bell
3 ways to increase the strength of an electromagnet
What is soft iron?