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8th magnets review packet
1) What elements are ferromagnetic?
2) If a nail is placed against a magnet, what happens to its magnetic domains?
3) If a nail is placed against a magnet, what will the nail do to other objects made from magnetic
materials?
4) What happens to the magnetic field around a wire if the current in the wire increases?
5) Is it true that both permanent magnets and electromagnets have north and south poles?
6) For the electromagnet to attract and then repel the permanent magnet in the speaker, what has to
happen?
7) What makes an electric motor spin?
8) If I put a magnet in a wire loop, what must happen for it to generate electricity?
9) Describe two ways you can create an electric current with a wire and a magnet.
10) What term describes an electric current that changes direction in a regular pattern?
11) Mr. Vance was watching Gilligan’s island, and the professor wanted to make an electric generator
out of a bicycle. What else would he need to find?
12) Any power plant needs ______________________ energy to change into electricity.
13) Describe the loops in the coils of a step-up transformer.
14) If power is sent over long distances, what is needed before that power can be used in homes?
15) What does the south pole of a magnet do to a north pole of another magnet?
16) Gadzooks! I dropped my magnet and it broke into 2 pieces! What do I have now?
17) Where is the strongest part of a magnetic field?
18) Define “magnetic field”.
19) When is an electromagnet a magnet?
20) If you change the current on an electromagnet, what can you change?
21) What does a transformer do?
22) What is direct current?
23) What term describes elements, including iron, nickel, and cobalt, that have an especially strong
attraction to magnets?
24) A group of atoms whose magnetic fields point in the same direction is known as a(n):
25) Define magnetic force.
26) What is a device that uses an electric current to produce motion?
27) What type of magnet created by wrapping a current-carrying wire around a ferromagnetic core?
28) Define “magnet”.
29) Explain what makes the material in a paperclip a magnetic material without it actually being a
magnet.
30) What is a turbine?
31) How does a generator work?
32) Why does a paperclip becomes a magnet when touching a magnet?
33) Any material, including magnets themselves, that is strongly attracted to a magnet would be called:
34) For your science fair project, you decide to create a magnet with just a north pole, but no south
pole. Why are you pretty much doomed to failure?
35) Which of the three diagrams below shows the arrangement in a magnet? In something nonmagetic?
a.
b.
36) I 5)
37)
c.