GCSE Physics – Electromagnets – Primrose Kitten

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GCSE Physics – Electromagnets

Last updated: 13/05/2020

AQA GCSE Science – Combined science higher Magnetism and electromagnets GCSE Physics – Electromagnets

Learning Objectives

-I can describe how to change the strength of an electromagnet
-I can explain how an electromagnet works

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Question 1 of 25

1. Question
What is a magnetic field?
- The region around a magnet where a force acts on another magnet or magnetic material
- The region around a magnet where a force acts on everything
- The region inside a magnet where a force acts on everything
- The region inside a magnet where a force acts on another magnet or magnetic material
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Question 2 of 25

2. Question
What is a uniform magnetic field?
- A magnetic field that has even strength everywhere
- A magnetic field that has no strength everywhere
- A magnetic field that is different everywhere
- A magnetic field that cannot be predicted
Correct

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Question 3 of 25

3. Question
What are the main magnetic materials?
- Iron, nickel, cobalt
- Iron, nickel, carbon
- Nickel, cobalt, oxygen
- Iron, cobalt, boron
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Question 4 of 25

4. Question
Why is steel magnetic?
- Because it contains iron
- Because it contains nickel
- Because it contains cobalt
- Because it contains oxygen
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Question 5 of 25

5. Question
What do we call a wire which electricity can flow through?
- A conducting wire
- An insulating wire
- A conducting plastic
- An insulating plastic
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Question 6 of 25

6. Question
What happens when a current flows through a conducting wire?
- A magnetic field is produced around the wire
- A magnetic field is produced in the wire
- The wire is charged
- The wire gains gravitational potential energy
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Question 7 of 25

7. Question
What does the strength of the magnetic field around a wire depend on?
- The current flowing through the wire
- The amount of electrons in the wire
- The amount of electric charge in the wire
- The time taken
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Question 8 of 25

8. Question
What else does the strength of the magnetic field around a wire depend on?
- How close the object is to the wire
- How large the object is
- How small the object is
- The gravitational field of the object
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Question 9 of 25

9. Question
What is the right thumb rule?
- A rule which shows the direction of magnetic field around a current
- A rule which shows the direction of magnetic field around plastics
- A rule which shows the direction of current around a magnetic field
- A rule which shows the direction of force around a current
Correct

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Question 10 of 25

10. Question
What does the right hand rule say?
- Point your right hand thumb in the direction of the current. Your fingers curl in the direction of the magnetic field.
- Point your right hand thumb in the direction of the force. Your fingers curl in the direction of the magnetic field.
- Point your right hand thumb in the direction of the field. Your fingers curl in the direction of the current.
- Point your right hand thumb in the direction of the field. Your fingers curl in the direction of the force.
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Question 11 of 25

11. Question
What can we make with just a wire?
- A solenoid
- An electromagnet
- A generator
- A solenoid
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Question 12 of 25

12. Question
What is a solenoid?
- A wire coiled up into a spiral shape
- A wire coiled into a ball
- A wire in the shape of a square
- A wire in a cube shape
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Question 13 of 25

13. Question
What happens when current flows in a solenoid?
- The shape of the magnetic field is similar to the field of a bar magnet
- There is no magnetic field
- The magnetic field is infinite
- The magnetic field is random, and not like the magnetic field of a bar magnet
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Question 14 of 25

14. Question
What does an iron core do to a solenoid?
- Increases the solenoid's magnetic field strength
- Decreases the solenoid's magnetic field strength
- Increases the gravitational potential energy of the solenoid
- Does not change the magnetic field of the solenoid
Correct

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Question 15 of 25

15. Question
What is the magnetic field inside a solenoid like?
- Strong and uniform
- Strong and random
- Weak and uniform
- Weak and random
Correct

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Question 16 of 25

16. Question
What do the small magnetic fields caused by each coil in a solenoid do?
- Add together to make a stronger overall magnetic field
- Cancel out
- Add together to make a weaker overall magnetic field
- Add together to make an infinite overall magnetic field
Correct

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Question 17 of 25

17. Question
How could you increase the magnetic field strength of a solenoid?
- Increase the current through the coils
- Decrease the current through the coils
- Make the current through the coils = 0
- Do not change the current through the coils
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Question 18 of 25

18. Question
How else could you increase the magnetic field strength of a solenoid?
- Increase the number of coils
- Decrease the number of coils
- Make the number of coils 0
- Make the number of coils infinite
Correct

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Question 19 of 25

19. Question
What is an electromagnet?
- A solenoid with an iron core
- A solenoid with a plastic core
- A solenoid with a glass core
- A solenoid without a metal core
Correct

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Question 20 of 25

20. Question
Why are electromagnets used in magnetic separators?
- As they can pick up magnetic material
- As they cannot pick up magnetic material
- As they are not made of metal
- As they are made of plastics
Correct

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Question 21 of 25

21. Question
Why are electromagnets used in cranes?
- As they can be turned on and off
- As they are permanent
- As they cannot be turned on or off
- As they always attract magnetic objects
Correct

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Question 22 of 25

22. Question
What can electromagnets be used in?
- All of these answers
- Doorbells
- Fridge doors
- Cranes
Correct

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Question 23 of 25

23. Question
What else are electromagnets used for?
- All of these answers
- Speakers
- Headphones
- Doorbells
Correct

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Question 24 of 25

24. Question
How can an electromagnet be turned on?
- By letting current flow
- By letting potential difference flow
- By letting resistance flow
- By letting power flow
Correct

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Question 25 of 25

25. Question
How can an electromagnet be turned off?
- By turning current off
- By turning potential difference off
- By setting resistance = 0
- By increasing power
Correct

Incorrect

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