GCSE Physics – Magnetic flux density

Last updated: 13/05/2020
AQA GCSE Science – Combined science higher Magnetism and electromagnets GCSE Physics – Magnetic flux density

Learning Objectives

-I can describe what happens to an object when work is done on it
-I can recall the units needed for F = BIl
-I can rearrange F = BIl
-I can use F = BIl

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  1. Current
  2. Review
  3. Answered

  1. What does the motor force depend on?

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  2. What causes a force to act on a conductor in a magnetic field?

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  3. What is magnetic flux density?

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  4. What does magnetic flux density show?

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  5. What is the formula for the force produced in the motor effect?

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  6. Rearrange the magnetic flux density equation to show magnetic flux density as the subject.

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  7. Rearrange the magnetic flux density equation to show the length of the wire as the subject.

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  8. Rearrange the magnetic flux density equation to show current as the subject.

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  9. What is B in the magnetic flux density formula?

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  10. What is I in the magnetic flux density formula?

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  11. What is L in the magnetic flux density formula?

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  12. What is magnetic flux density measured in?

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  13. What else can magnetic flux density be measured in?

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  14. How is current measured?

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  15. What is the length of wire measured in?

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  16. What is the symbol for Tesla?

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  17. What force is produced when B = 0.5 T, I = 5.0 A and L = 45 cm?

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  18. What force is produced when B = 1.2 T, I = 4.8 A and L = 22 cm?

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  19. What is the length of the wire if 10.0 A of current causes a force of 3.1 N if B = 0.96 T?

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  20. What is the length of the wire if 2.5 A of current causes a force of 5 N if B = 2.5 T?

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  21. What is the length of the wire if 4.0 A of current causes a force of 3.7 N if B = 2.3 T?

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  22. A 35 cm long piece of string experiences a force of 0.98 N when a current of 5.0 A flows through it. Calculate the magnetic flux density of the field.

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  23. A 50 cm long piece of string experiences a force of 1.4 N when a current of 2.0 A flows through it. Calculate the magnetic flux density of the field.

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  24. A 15 cm long piece of string experiences a force of 2.4 N when a current of 10.0 A flows through it. Calculate the magnetic flux density of the field.

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  25. A 5 cm long piece of string experiences a force of 4 N when a current of 20.0 A flows through it. Calculate the magnetic flux density of the field.

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