Across
- 2. The most important cause of magnetism in magnetic materials.
- 9. A semiconductor device that emits light at a low temperature when direct current is applied.
- 11. The most common type of electrostatic generator in use today.
- 12. A group of aligned atoms with one magnetic field.
- 13. The form of the mineral magnetite used since ancient times as a natural compass.
- 14. A modern device used to store static electric charge.
- 16. An early device used to store electric charge.
- 17. Regions of concentrated magnetism.
- 19. Aluminum, which has one unpaired electron and is slightly attracted by either pole of a magnet is a ________ substance.
- 20. An electrostatic method of reproducing images on paper.
Down
- 1. A device that emits light from a filament heated to extremely high temperatures.
- 3. The principle that relates the force between two magnets.
- 4. The type of electric motor that needs a commutator to reverse the current in the armature.
- 5. A permanent magnet is made from a magnetically ______ material.
- 6. Diamond, which lacks unpaired electrons and is slightly repelled by either pole of a magnet, is a ______ substance.
- 7. The direction and strength of a magnetic field is indicated by imaginary lines called _____.
- 8. A simple device that converts electricity to back-and-forth motion.
- 10. How strongly the magnetic force acts through a material is determined by the material's _____.
- 15. A device that converts electricity into sound waves.
- 18. An electric switch operated by an electromagnet.