| A | B |
|---|
| magnetic field | surrounds a magnet and exerts a magnetic force |
| magnetic domain | a group of atoms whose fields point in the same direction |
| magnetosphere | region of space affected by Earth's magnetic field |
| magnetic field lines | show attraction and repulsion |
| strongest magnetic field | close to the magnetic poles |
| a compass needle is a small | bar magnet with a north and south magnetic pole |
| electromagnet | magnet created by wrapping a current carrying wire around an iron core |
| motor | a device that transforms electrical energy into kinetic energy |
| aurora | a light display that occurs when charged particles trapped in the magnetosphere collide with Earth's atmosphere |
| generator | a device that uses a magnetic field to turn kinetic energy into electrical energy |
| alternating | current that is changing its position repeatedly |
| direct | current that flows only in one direction |
| transformer | a device used to increase or decrease the voltage of an alternating current |
| ammeters and voltmeters | used to measure current and voltage in electric circuits |
| a battery produces | direct current |
| superconductor | no heat is produced when current runs through it |
| MRI | Magnetic Resonance Imaging |
| moving electric charges produce | magnetic fields, and magnetic fields exert forces on moving electric charges |
