| A | B |
|---|
| poles | the ends of a magnet are called |
| north and south | the names of the poles of a magnet |
| repel | how like (N-N or S-S) poles react to each other |
| attract | how unlike poles (N-S) react to each other |
| two | the smallest piece of a magnet has this many poles |
| magnet | all the atoms line up so that all the north poles point in the same direction |
| magnetic domain | group of atoms with their magnetic poles pointing in the same direction |
| magnetism | force created through a magnetic field |
| force | push or pull that can cause an object to move |
| magnetic force | affects only objects that have magnetic domains |
| field | magnetic force acts through this |
| magnetic field | extends between a magnet's north and south poles |
| magnetic field lines | closer together where the magnetic field is strongest |
| poles | Earth's magnetic field lines dip toward Earth here |
| show attraction | magnetic field lines that meet |
| repulsion | magnetic field lines that curve away from each other |
| magnetosphere | Earth's magnetic field |
| magnetite | stone that attracts iron |
| compass | magnetic needle that is free to turn |
| steel and iron | can become magnets |
| electromagnetism | when electrons move in a wire, there is a magnetic field around the wire |
| electromagnet | current-carrying wire wrapped around an iron core |
| electric motor | uses the interaction between electricity and magnetism to convert electric energy into motion |
| Aurora borealis | colored lights in the sky |
| induction | when a wire loop move through a magnetic field and causes a current in the loop |
| electric generator | uses induction to produce electric power by spinning a wire coil in a strong magnetic field |
| direct current | flows in one direction only |
| alternating current | changes direction many times each second |
| transformer | changes the voltage of an alternating current |
