1. Magnets
TCAP Worksheet #9

2. Magnets Any material that attracts iron or materials containing iron.
Magnets have a North and South pole.
Magnetism depends on the material’s atoms.

3. Magnetic Domains
If most of the domains in an object are aligned, the magnetic fields of the individual domains combine to make the whole object magnetic.

4. Demagnetized When domains move, the magnet is demagnetized. HOW??
Dropping a magnet or hitting it too hard.
Putting the magnet in a strong magnetic field that is opposite to its own.
Increasing temperatures of a magnet.

5. Types of Magnets
Ferromagnets – Magnets made with iron, nickel, cobalt, or mixtures of those metals.
Electromagnets – Magnets made by an electric current.
Temporary – Magnets made from materials that are easy to magnetize.
Permanent – Magnets made from materials that are difficult to magnetize but keep their magnetism.

6. Earth as a Magnet
The North Pole and the Magnetic North Pole are two different locations.
Same with the South Poles.

7. Electromagnetism
Electromagnetism - The interaction between electricity and magnetism
Electric current produces a magnetic field.
Therefore, you can use electricity to produce a magnet.

8. Solenoid
Solenoid is a coil of wire that produces a magnetic field when carrying an electric current.
An electromagnet is a solenoid wrapped around an iron core.
This is a magnetic field.

9. Solenoid Strength of a solenoid can increase by two ways.
More loops in the wire.
Electric current is increased.

10. Electromagnetism Example – Doorbell
When the current is turned off, then the magnet is “turned off”

11. Measuring
Galvanometer is used to measure electric current.

12. Electricity from Magnetism
Electromagnetic induction is the process of creating a current in a circuit by changing a magnetic field.
You can move the magnet through the coil wire. (Changing the magnetic field).
Move it faster through the coil wire.
Remove the magnet from the coil wire.
Add more loops to wire.

13. Eek!