Magnetic basics
The two poles of a magnet
What is North and south?
Name a metal that is magnetic.
What is iron/nickel/cobalt
What do you need to make an electromagnet?
Battery, wire coil, iron nail
Field lines travel from which pole to which pole?
North to south
What device uses a magnet to show direction?
Compass
True or False: Like poles attract.
False
Is aluminium magnetic?
No
What creates the magnetic field in an electromagnet?
Electric current
What does it mean when field lines are closer together?
Stronger magnetic field
What do doorbells use to produce sound?
Electromagnets
What happens when you cut a magnet in half?
You get two smaller magnets, each with N and S poles
Why is steel magnetic?
It contains iron
How can you make an electromagnet stronger?
More coils / higher voltage / soft iron core
What tool can help us “see” magnetic fields?
Iron filings
What makes speakers vibrate?
Changing magnetic fields
The push or pull between magnetic poles is called what?
Magnetic force
What term describes materials that are NOT attracted to magnets?
Non-magnetic materials
Can an electromagnet be turned on and off?
Yes
Where is a magnet’s field strongest?
At the poles
What type of magnet is used in MRI machines?
Electromagnets
What invisible area around a magnet shows its strength?
Magnetic field
True or False: Copper is magnetic.
False
Why do scrapyards use electromagnets?
To lift and drop heavy metal objects
What shape are the field lines around a bar magnet?
Curved loops
Which home appliance relies on magnets to spin?
Electric motor