1. Ch.14- Test 1 (2nd 9 wks) Review
Magnetism

2. How would you label pole 2 in the picture below?

3. The picture below shows a piece of iron before it has become magnetized. What will the domains (groups of atoms) look like after it is magnetized?

4. What is responsible for generating Earth’s magnetic field?

5. How can a student increase the strength of the magnetic field around the electromagnet?

6. Which statement best compares the magnetic field of Earth to the magnetic field of a bar magnet?
A. Magnetic field lines around Earth are symmetrical but magnetic field lines around a bar magnet are not symmetrical.
B. Magnetic field lines around Earth are in a circular pattern but magnetic field lines around a bar magnet extend away from the magnet.
C. Magnetic field lines for both Earth and a bar magnet are generated from convection currents.
D. Magnetic field lines for both Earth and a bar magnet emerge from their north poles.

7. What causes the northern lights?

8. A student made an electromagnet by wrapping copper wire around an iron nail. The student then connected each end of the electromagnet to the opposite terminals of a battery. The electromagnet will best function as a magnet as long as
A. electric current flows through the wire.
B. electrical energy is transformed into mechanical energy.
C. electrical energy is transformed into potential energy.
D. electric current flows through the nail.

9. A student has a magnet and wire coil
A student has a magnet and wire coil. Draw a diagram that best shows how the student can use the magnet and wire coil to produce electricity?

10. A student built a prototype of an electromagnet
A student built a prototype of an electromagnet. The electromagnet was designed to produce a strong magnetic field. How can the student best test the strength of the electromagnet?
A. place a thermometer near the electromagnet, and record changes in the air temperature
surrounding the electromagnet
B. connect the electromagnet to a simple circuit that contains a battery and light bulb, and then
observe if the bulb glows
C. attach an iron bar to a spring scale, place the iron bar near the electromagnet, and record the force
reading on the spring scale
D. place the electromagnet on an electronic balance, and record its mass in kilograms

11. Draw a diagram that shows a magnetic field most similar to the magnetic field of Earth?

12. Draw an electromagnet, label the 3 parts, and draw the magnetic field lines.

13. As the magnet moves back and forth, the meter indicates

14. Compare the magnetic field strength of a permanent magnet and an electromagnet?

15. A student coils a copper wire around a bar magnet
A student coils a copper wire around a bar magnet. Which action will cause the device to generate electricity?

16. Draw a diagram that shows an apparatus that is correctly set up to produce and measure electricity?

17. What device is the diagram representing?

18. Draw the magnet that would provide the best example for the magnetic poles and magnetic fields of Earth?

19. True or False
The magnetic domain is the area
around a magnet where the force acts.

20. The south pole of a magnet ________.
Repels a paper clip
Attracts a north pole
Repels a north pole
Attracts another south pole

21. True or False
Moving a wire through a magnetic field
creates an electric current in a wire.

22. When you break an iron magnet into
two pieces, you get ___________________.
Two south poles
Two north poles
A piece of iron that is no longer magnetic
Two north poles and south poles

23. The location of the strongest magnetic field
is the _________________.
Center of the magnet
Magnetic domains
Magnetic fields
Magnetic poles

24. The region around a magnet where the
magnetic forces act is the ________________.
Electromagnet pole
Magnetic domain
Magnetic field
Magnetic pole

25. The magnetic domains of the atoms in
a magnet are ______________________.
Arranged randomly
Lined up
Negatively charged
Positively charged

26. An electromagnet is ___________________.
A permanent magnet
Made with bar magnets
Attracts all metal substances
Only operating when the current is on

27. A current carrying wire wrapped around an
iron core is called an ___________________.
Generator
Conductor
Transformer
Electromagnet

28. Changing the current changes the
________________ of an electromagnet.
Strength
Direction
Charge
Strength and direction

29. Unlike poles of a magnet ____________.

30. _______________________ is Earth’s magnetic field
extended into space.

31. Homing pigeons have pieces of _________________
in their brains to help them find their way home.

32. What happens to the magnetic domains
of a magnetized paper clip when the
magnetizing magnet is removed?

33. Name two ways of increasing the magnetic
field of an electromagnet.

34. True or False
When you bring the south ends of two
magnets close together, they repel each other.

35. True or False
A paper clip magnetized by a bar
magnet is permanently magnetized.

36. True or False
The field of a magnet is weakest at its poles.

37. True or False
The magnetic domains of a permanent
magnet are arranged randomly.

38. True or False
A current carrying wire produces a magnetic field.

39. True or False
The strength of an electromagnet can be increased
by reducing the number of turns on the wire coil so
that more current can flow.

40. True or False
The Earth’s magnetic field is called
the magnetic domain.

41. True or False
Because of the magnetic field, magnets do
have to touch to affect each other.