Name:_______________
Date:__________
1. The places on a magnet where the magnetic forces are strongest are called the _____.
2. The _____ are at the end of most magnets.
3. If the poles of a magnet are allowed to swing freely, one will line up facing _____ and the other will line up facing _____.
4. The two poles of a magnet are called the _____-_______ pole and the _____-_______ pole.
5. The north-seeking poles of two magnets will _____ each other.
6. The south-seeking poles of two magnets will ______ each other.
7. The north-seeking pole of one magnet will be _________ to the south-seeking pole of another magnet.
8. For magnets, like poles _____ and unlike poles _______.
9. The north-seeking and south-seeking poles of a magnet ______ be separated.
10. If you cut a bar magnet in half, this results in two magnets, each having a _____ and a _____-seeking pole.
11. In a magnetized object, it is believed that _________ and _______ become lined up opposite each other.
12. For objects which are attracted to magnets, the ________ or ________ force of the magnet causes these materials to have their _______ and _________ line up in a similar, but ________ way.
13. Metals which are attracted to magnets include ____, ______ and ______.
14. The longer materials are exposed to a magnet, the ______ it takes for these materials to return to their normal alignment.
15. If exposed to a strong magnet for a long period of time, some materials become ___________ magnets.
16. Magnetic properties can be destroyed by _______ and by _______ the magnet.
17. The region around a magnet where its magnetic force can act is called a ________ _____.
18. Earth has a core of iron which is a ______ and produces a ________ _____.
19. The needle of a compass is also a ______.
20. Earth's magnetic north pole is in ________ ______, just north of the _____ ______.
21. Earth's magnetic south pole is near the ________ ______.
22. Earth's ________ north and south-seeking poles are not exactly at the __________ north and south poles.
23. A ______ can be used to determine if a wire is carrying an electric current.
24. An electric current produces a ________ field.
25. The magnetic field produced by electricity is called an ______________ _____.
26. The stronger the electric current in a wire, the ________ the electromagnetic field.
27. You can also make the electromagnetic fields stronger by _______ up a wire which carries an ________ current.
28. The ____ wire you have ______ up, the stronger the
electromagnetic field.
29. The same electric current will have a stronger electromagnetic field if it is going though ______ wire.
30. The magnetic fields of a coiled wire through which electric current flows can be made even stronger by placing an ____ ___ inside the coiled wire.
31. An iron bar inside a coil of wire through which electric current is flowing is called an ______________.
32. The ____________ is magnetic only when electric current is flowing through the wire.
33. An electromagnet can be turned on or off by turning on or off the ________ _______.
34. What two things determines the strength of an electromagnet?
1.__________________________________________________________
2.__________________________________________________________
35. A ____________ is an instrument which can detect small electric currents.
36. The human nervous system runs on ________ _______.
37. If a person becomes slightly _______, a galvanometer can detect this increase in the electric current in the _____.
38. The ________ _____ ________ (_ _ _) can be used as an emotion detector, and it is one of the measurements taken in a _ ________ or a ___ _______ ____.
39. If a magnet can be made using electric current, ________ _______ can be made using a magnet.
40. Wire has electrons which are free to ____.
41. When a coil of wire is moved along a magnet, the _________ of the wire will move. This is called _________.
42. Electric generators produce electric current through _____________ _________.
43. LP&L generates the electricity used in homes and businesses by
rotating a ____ ___ ____ through a magnetic ______.