Magnetic Fields
What is magnetic field?
The area around a magnet through which force is exerted.
How does a compass use Earth's magnetic field to work?
A compass, a magnetic needle free to turn, can be used to detect Earth’s magnetic field. Or the bar's south end will turn to the north end of earth's magnetic field.
What is an electromagnet?
a current-carrying wire wrapped around an iron core
What did people discover thousands of years ago?
magnetite
What is magnetic domain?
A group of atoms with their fields pointing in the same direction
What has happened to Earth's magnetic field?
Hint: Different
Reversed
What is repelled by a superconductor?
A magnet
A generator turns ____ into _____. What are the 2 blanks?
motion, electricity
Where are magnetic fields strongest?
The poles
What do ancient rocks reveal from a long time ago?
Earth's magnetic field orientation.
What is a superconductor?
a material that has no resistance to the flow of electrons
How many magnetic domains does a magnet have?
A large amount
What causes magnetic field?
Moving electric charges
What is the name of Earth's magnetic field?
magnetosphere
What use electromagnets to operate?
Doorbells and High-Speed trains
A motor turns _____ into _____. What are the 2 blanks?
electrical energy, kinetic energy
What do you use to see the magnetic field?
Iron filings
What does Earth's magnetic field deflect?
Charged Particles from the Sun.
The magnetic field of an electromagnet is turned on or off when...
the electric current is turned off.
How can iron act like magnetite?
When it is rubbed on magnetite.