Electromagnets: Principles and Applications
Explore the fascinating world of electromagnets with this Grade 7 science worksheet, covering their construction, properties, and everyday uses.
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Electromagnets: Principles and Applications
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Read each question carefully and answer to the best of your ability. Good luck!
1. Which of the following materials is essential for creating an electromagnet?
Plastic rod
Copper wire
Glass tube
Wooden stick
2. The strength of an electromagnet can be increased by:
Decreasing the number of turns in the coil
Using a weaker battery
Increasing the current flowing through the coil
Removing the iron core
3. An electromagnet is a type of magnet in which the magnetic field is produced by an electric .
4. The core of an electromagnet is typically made of a material like iron.
5. Observe the diagram of an electromagnet below. Label the power source, wire coil, and iron core.
Power Source:
Wire Coil:
Iron Core:
6. Give two examples of how electromagnets are used in everyday life.
7. An electromagnet's magnetic field is always present, even when the electric current is turned off.
True
False
8. Increasing the voltage of the power source will decrease the strength of an electromagnet.
True
False
Match the term to its definition.
9. Magnetic Field
a. Flow of electric charge
10. Current
b. Area around a magnet where magnetic force is exerted
11. Coil
c. Wire wound in a spiral shape