Magents and electromagnets Flashcards
(15 cards)
Magnetism
An invisible force that pushes or pulls magnetic material
Name 3 magnetic metals
Iron
Cobalt
Nickel
Are magnetic field lines visible
No, they are only visible by using a compass or other magnetic material like iron fillings
Do like poles repel or attract
Repel
Do opposite poles repel or attract
Attract
Which magnet attracts to North
South magnet
Which magnet attracts to South
North magnet
How many poles does a magnet have
2
What type of magnets are electromagnets
Temporary magnets because they only work when electricity flows through them
What are electromagnets often made with
Iron
What is needed to create an electromagnet
A current
What is a bar magnet an example of
A permanent magnet
What are the differences between an electromagnet and a bar magnet
A magnet is permanent and an electromagnet is temporary. On the electromagnet the magnetic field can be turned on and off
What are 2 uses of electromagnets
Electric doorbell and MRI machines
How can you make an electromagnet stronger
Increasing the number of coils
Increase the current
