Download Electromagnetism Unit Study Guide

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Date: ______
Electromagnetism Unit Study Guide
1. What is the invisible force field that surrounds magnets?
Magnetic field
2. Draw in the magnetic field line of this magnet, label the direction:
N
S
3. Where is the strongest part of a magnet?
At the poles
4. Below is a picture of the domains of atoms of an unmagnetized object, draw in the domains
of a magnetized object:
5. Draw in the domains if a bar magnet were broken in half, label the poles:
S
N
S
N
6. What is a compass and how does it work?
A compass is a freely moving magnet that aligns with the Earth’s magnetic field.
8. What is true about Earth’s geographic vs. magnetic poles?
They are opposite; the Magnetic North pole is located at the
geographic South Pole and vice versa.
9. A current flowing through a wire produces _a magnetic field__
10. What 3 things can be done to strengthen the magnetic
field of this coil of wire:
A. Increase the current
B. Add more coil turn
C. Add an iron core
current
11. This device (pictured to the right) is called an _electromagnet______.
Independent variable: _current______
Dependent variable: __magnetic field____
Magnetic field
12. Graph the relationship between the current and the strength of the magnetic field in an
electromagnet:
Current
13. What happens when you bring a current carrying wire near a compass? Why?
The compass needle will move because the current in the wire creates a magnetic
field.
14. The device pictured below is an electric motor. Explain how it works below:
When current flows through the armature (coil), it creates a
magnetic. The magnetic field of the permanent magnet
interacts with the magnetic field of the coil and exerts a
force on it that makes it spin.
15. Electric motors convert electrical energy into mechanical energy.
16. In what 3 ways can you increase the amount of current induced through the coil?
A. Use more magnets / stronger magnet
B. Move the magnet faster
C. Use a bigger coil / coil with more turns
17. Electromagnetic induction is the name for the process of producing electric current
with a moving magnet.
18. What type of current is produced by this process? How do you know?
AC (alternating current), because the magnet
moves back and forth creating a current the
changes direction back and forth.
19. What is this device and explain how it works:
Generator. When the magnetic field through the
loop of wire is changing, a current is generated due
to electromagnetic induction
20. List 3 other types of energy that can be used to power a generator?
A. Wind
B. Hydroelectric
C. Geothermal
21. Electric generators convert mechanical energy into electrical energy.
22. Magnetism is produced by moving electrons.
23. State one difference and one similarity between electric charges and magnetic poles.
Both magnetic poles and electric charges can attract and repel.
Electric charges can be isolated but magnetic poles cannot (magnetic monopoles do
not exist).
24. What do scientists think causes the Aurora borealis (Northern Lights)?
When particles from the sun come near the Earth’s magnetic poles where they
give off streaks of colorful light.