Download magnets ch.18

Magnets Ch. 18
1. p454 Today any material that attracts iron or materials containing iron is called a ________.
2. p454 The parts of a magnet where the magnetic effects are strongest are called _______.
3. p454 The magnetic effects are strongest near the ______ of the bar magnet.
4. p 455 The force of repulsion or attraction between the poles of magnets is called the _____.
5. p 456 A ________ _________ exists in the region around a magnet in which magnetic force
can act.
6. p456 The atoms in a _____ are arranged so that the north and south poles of all the atoms
____ line up and create a strong magnetic _______.
7. p457 A magnet can be made from an unmagnetized object made of iron, cobalt, or nickel by
_________ the domains in the object.
8. p458 When you cut a magnet in half, you end up with ______ magnets, each with its own
______ pole and _______ pole.
9. p458 Magnets made with these metals have strong magnetic properties and are called
____________.
10. p458An ___________________ is a magnet usually with an iron core, produced by an
electric current.
11. p459 In fact, Earth behaves as if it has a _______ _______ running through its center.
12. p460 So a compass needle points to the north because its north pole is attracted to a very
large magnetic ________ ________.
13. p463 Oersted concluded that an electric current produces a ________ field and that the
direction of the magnetic filed depends on the direction of the __________.
14. p463 A _____________ is a coil of wire that produces a magnetic fdield when carrying an
electric current.
15. p464 A ________________ is a magnet that consists of a solenoid wrapped around an iron
core.
16. p464 Electromagnets attract objects containing iron only when a _______ exists in the wire.
17. p466 An _________ ________ is a device that changes electrical energy into _________
energy.
18. p469 The process by which an electric current is produced by a changing magnetic field is
called ____________________ ____________________.
19. p470 A _____________ is a device that uses electromagnetic induction to convert ________
energy into _________________ energy.
20. p 470 What are the three parts of a Simple Generator?